000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Condensed Consolidated Statements of Income (Unaudited) link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited) link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) link:calculationLink link:definitionLink link:presentationLink 006 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 007 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:calculationLink link:definitionLink link:presentationLink 008 - Disclosure - Note 1 - Basis of Presentation link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note 2 - Revenue link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 3 - Segment Information link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 4 - Rates and Regulatory Matters link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 5 - Other Investments link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 6 - Line of Credit link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 7 - Long-Term Debt link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 8 - Derivatives and Hedging link:calculationLink link:definitionLink link:presentationLink 016 - Disclosure - Note 9 - Fair Value Measurements link:calculationLink link:definitionLink link:presentationLink 017 - Disclosure - Note 10 - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 018 - Disclosure - Note 11 - Other Comprehensive Income (Loss) link:calculationLink link:definitionLink link:presentationLink 019 - Disclosure - Note 12 - Income Taxes link:calculationLink link:definitionLink link:presentationLink 020 - Disclosure - Note 13 - Regulatory Assets and Liabilities link:calculationLink link:definitionLink link:presentationLink 021 - Disclosure - Note 14 - Commitments and Contingencies link:calculationLink link:definitionLink link:presentationLink 022 - Disclosure - Note 15 - Employee Benefit Plans link:calculationLink link:definitionLink link:presentationLink 023 - Disclosure - Note 16 - Leases link:calculationLink link:definitionLink link:presentationLink 024 - Disclosure - Note 17 - Subsequent Events link:calculationLink link:definitionLink link:presentationLink 995471 - Disclosure - Note 2 - Revenue (Tables) link:calculationLink link:definitionLink link:presentationLink 995472 - Disclosure - Note 3 - Segment Information (Tables) link:calculationLink link:definitionLink link:presentationLink 995473 - Disclosure - Note 5 - Other Investments (Tables) link:calculationLink link:definitionLink link:presentationLink 995474 - Disclosure - Note 7 - Long-Term Debt (Tables) link:calculationLink link:definitionLink link:presentationLink 995475 - Disclosure - Note 9 - Fair Value Measurements (Tables) link:calculationLink link:definitionLink link:presentationLink 995476 - Disclosure - Note 10 - Earnings Per Share (Tables) link:calculationLink link:definitionLink link:presentationLink 995477 - Disclosure - Note 11 - Other Comprehensive Income (Loss) (Tables) link:calculationLink link:definitionLink link:presentationLink 995478 - Disclosure - Note 12 - Income Taxes (Tables) link:calculationLink link:definitionLink link:presentationLink 995479 - Disclosure - Note 13 - Regulatory Assets and Liabilities (Tables) link:calculationLink link:definitionLink link:presentationLink 995480 - Disclosure - Note 15 - Employee Benefit Plans (Tables) link:calculationLink link:definitionLink link:presentationLink 995481 - Disclosure - Note 16 - Leases (Tables) link:calculationLink link:definitionLink link:presentationLink 995482 - Disclosure - Note 1 - Basis of Presentation (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995483 - Disclosure - Note 2 - Revenue - Disaggregation of Revenue (Details) link:calculationLink link:definitionLink link:presentationLink 995484 - Disclosure - Note 2 - Revenue - Customer Accounts Receivable (Details) link:calculationLink link:definitionLink link:presentationLink 995485 - Disclosure - Note 3 - Segment Information (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995486 - Disclosure - Note 3 - Segment Information - Segment Information (Details) link:calculationLink link:definitionLink link:presentationLink 995487 - Disclosure - Note 4 - Rates and Regulatory Matters (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995488 - Disclosure - Note 5 - Other Investments (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995489 - Disclosure - Note 5 - Other Investments - Schedule of Other Investments (Details) link:calculationLink link:definitionLink link:presentationLink 995490 - Disclosure - Note 5 - Other Investments - Investment in Unconsolidated Entity (Details) link:calculationLink link:definitionLink link:presentationLink 995491 - Disclosure - Note 6 - Line of Credit (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995492 - Disclosure - Note 7 - Long-Term Debt (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995493 - Disclosure - Note 7 - Long-Term Debt - Long-term Debt (Details) link:calculationLink link:definitionLink link:presentationLink 995494 - Disclosure - Note 7 - Long-Term Debt - Long-term Debt (Details) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 995495 - Disclosure - Note 8 - Derivatives and Hedging (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995496 - Disclosure - Note 9 - Fair Value Measurements (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995497 - Disclosure - Note 9 - Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) link:calculationLink link:definitionLink link:presentationLink 995498 - Disclosure - Note 9 - Fair Value Measurements - Summary of the Fair Value of Financial Assets and Liabilities Not Adjusted to Fair Value (Details) link:calculationLink link:definitionLink link:presentationLink 995499 - Disclosure - Note 10 - Earnings Per Share (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995500 - Disclosure - Note 10 - Earnings Per Share - Earnings Per Share (Details) link:calculationLink link:definitionLink link:presentationLink 995501 - Disclosure - Note 11 - Other Comprehensive Income (Loss) - Schedule of Other Comprehensive Income and Loss (Details) link:calculationLink link:definitionLink link:presentationLink 995502 - Disclosure - Note 11 - Other Comprehensive Income (Loss) - Reconciliation of Accumulated Comprehensive Income (Loss) (Details) link:calculationLink link:definitionLink link:presentationLink 995503 - Disclosure - Note 12 - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995504 - Disclosure - Note 12 - Income Taxes - Income Positions (Details) link:calculationLink link:definitionLink link:presentationLink 995505 - Disclosure - Note 13 - Regulatory Assets and Liabilities (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995506 - Disclosure - Note 13 - Regulatory Assets and Liabilities - Schedule of Regulatory Assets (Details) link:calculationLink link:definitionLink link:presentationLink 995507 - Disclosure - Note 13 - Regulatory Assets and Liabilities - Schedule of Regulatory Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995508 - Disclosure - Note 14 - Commitments and Contingencies (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995509 - Disclosure - Note 15 - Employee Benefit Plans (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995510 - Disclosure - Note 15 - Employee Benefit Plans - Schedule of Components of Net Periodic Pension and Postretirement Benefit Cost (Details) link:calculationLink link:definitionLink link:presentationLink 995511 - Disclosure - Note 16 - Leases (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995512 - Disclosure - Note 16 - Leases - Lease Cost (Details) link:calculationLink link:definitionLink link:presentationLink 995513 - Disclosure - Note 16 - Leases - Operating Lease Maturity (Details) link:calculationLink link:definitionLink link:presentationLink