000 - Document - Document And Entity Information
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001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited)
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002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)
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003 - Statement - Condensed Consolidated Statements of Income (Unaudited)
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004 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited)
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005 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited)
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006 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals)
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007 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)
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008 - Disclosure - Note 1 - Basis of Presentation
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009 - Disclosure - Note 2 - Revenue
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010 - Disclosure - Note 3 - Income Taxes
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011 - Disclosure - Note 4 - Rates and Regulatory Matters
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012 - Disclosure - Note 5 - Other Investments
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013 - Disclosure - Note 6 - Derivatives and Hedging
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014 - Disclosure - Note 7 - Long-term Debt
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015 - Disclosure - Note 8 - Other Comprehensive Income (Loss)
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016 - Disclosure - Note 9 - Commitments and Contingencies
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017 - Disclosure - Note 10 - Earnings Per Share
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018 - Disclosure - Note 11 - Employee Benefit Plans
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019 - Disclosure - Note 12 - Fair Value Measurements
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020 - Disclosure - Note 13 - Segment Information
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021 - Disclosure - Note 14 - Regulatory Assets and Liabilities
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022 - Disclosure - Note 15 - Subsequent Events
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023 - Disclosure - Significant Accounting Policies (Policies)
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024 - Disclosure - Note 2 - Revenue (Tables)
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025 - Disclosure - Note 5 - Other Investments (Tables)
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026 - Disclosure - Note 7 - Long-term Debt (Tables)
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027 - Disclosure - Note 8 - Other Comprehensive Income (Loss) (Tables)
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028 - Disclosure - Note 10 - Earnings Per Share (Tables)
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029 - Disclosure - Note 11 - Employee Benefit Plans (Tables)
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030 - Disclosure - Note 12 - Fair Value Measurements (Tables)
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031 - Disclosure - Note 13 - Segment Information (Tables)
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032 - Disclosure - Note 14 - Regulatory Assets and Liabilities (Tables)
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033 - Disclosure - Note 2 - Revenue - Disaggregation of Revenue (Details)
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034 - Disclosure - Note 2 - Revenue - Customer Accounts Receivable (Details)
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035 - Disclosure - Note 3 - Income Taxes (Details Textual)
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036 - Disclosure - Note 4 - Rates and Regulatory Matters (Details Textual)
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037 - Disclosure - Note 5 - Other Investments (Details Textual)
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038 - Disclosure - Note 5 - Other Investments - Schedule of Other Investments (Details)
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039 - Disclosure - Note 5 - Other Investments - Investment in Unconsolidated Entity (Details)
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040 - Disclosure - Note 6 - Derivatives and Hedging (Details Textual)
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041 - Disclosure - Note 7 - Long-term Debt (Details Textual)
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042 - Disclosure - Note 7 - Long-term Debt - Long-term Debt (Details)
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043 - Disclosure - Note 7 - Long-term Debt - Long-term Debt (Details) (Parentheticals)
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044 - Disclosure - Note 8 - Other Comprehensive Income (Loss) - Schedule of Other Comprehensive Income and Loss (Details)
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045 - Disclosure - Note 8 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details)
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046 - Disclosure - Note 10 - Earnings Per Share - Earnings Per Share (Details)
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047 - Disclosure - Note 11 - Employee Benefit Plans - Schedule of Components of Net Periodic Pension and Postretirement Benefit Cost (Details)
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048 - Disclosure - Note 11 - Employee Benefit Plans - Schedule of Actual and Expected Employer Contributions (Details)
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049 - Disclosure - Note 12 - Fair Value Measurements (Details Textual)
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050 - Disclosure - Note 12 - Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details)
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051 - Disclosure - Note 12 - Fair Value Measurements - Summary of the Fair Value of Financial Assets and Liabilities Not Adjusted to Fair Value (Details)
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052 - Disclosure - Note 13 - Segment Information - Segment Information (Details)
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053 - Disclosure - Note 14 - Regulatory Assets and Liabilities (Details Textual)
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054 - Disclosure - Note 14 - Regulatory Assets and Liabilities - Schedule of Regulatory Assets (Details)
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055 - Disclosure - Note 14 - Regulatory Assets and Liabilities - Schedule of Regulatory Liabilities (Details)
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