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Note 14 - Income Tax Expense (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Income Before Income Taxes |  | $ | 20,789 |  |  | $ | 18,769 |  |  | $ | 50,695 |  |  | $ | 50,721 |
Tax Computed at Company’s Net Composite Federal and State Statutory Rate (26%) |  | $ | 5,405 |  |  | $ | 4,879 |  |  | $ | 13,181 |  |  | $ | 13,187 |
(Decreases) Increases in Tax from: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Differences Reversing in Excess of Federal Rates |  |  | (543 | ) |  |  | (774 | ) |  |  | (1,772 | ) |  |  | (1,757 | )
Allowance for Funds Used During Construction – Equity |  |  | (248 | ) |  |  | (94 | ) |  |  | (560 | ) |  |  | (180 | )
Excess Tax Deduction – Equity Method Stock Awards |  |  | - |  |  |  | - |  |  |  | (535 | ) |  |  | (827 | )
North Dakota Wind Tax Credit Amortization – Net of Federal Taxes |  |  | (258 | ) |  |  | (258 | ) |  |  | (516 | ) |  |  | (516 | )
Research and Development and Other Tax Credits |  |  | (333 | ) |  |  | (187 | ) |  |  | (387 | ) |  |  | (375 | )
Corporate Owned Life Insurance |  |  | (193 | ) |  |  | (150 | ) |  |  | 14 |  |  |  | (559 | )
Other Items – Net |  |  | (22 | ) |  |  | (73 | ) |  |  | 21 |  |  |  | (2 | )
Income Tax Expense |  | $ | 3,808 |  |  | $ | 3,343 |  |  | $ | 9,446 |  |  | $ | 8,971 |
Effective Income Tax Rate |  |  | 18.3 | % |  |  | 17.8 | % |  |  | 18.6 | % |  |  | 17.7 | %
Summary of Income Tax Contingencies [Table Text Block] |
(in thousands) |  | 2020 |  |  | 2019 |
Balance on January 1 |  | $ | 1,488 |  |  | $ | 1,282 |
Decreases Related to Tax Positions for Prior Years |  |  | (42 | ) |  |  | - |
Increases Related to Tax Positions for Current Year |  |  | 81 |  |  |  | 75 |
Uncertain Positions Resolved During Year |  |  | - |  |  |  | (42 | )
Balance on June 30 |  | $ | 1,527 |  |  | $ | 1,315 |

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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