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Note 14 - Income Tax Expense (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Income Before Income Taxes |  | $ | 45,031 |  |  | $ | 29,681 |  |  | $ | 95,726 |  |  | $ | 80,402 |
Tax Computed at Company’s Net Composite Federal and State Statutory Rate (26%) |  | $ | 11,708 |  |  | $ | 7,717 |  |  | $ | 24,889 |  |  | $ | 20,905 |
(Decreases) Increases in Tax from: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Differences Reversing in Excess of Federal Rates |  |  | (1,678 | ) |  |  | (933 | ) |  |  | (3,450 | ) |  |  | (2,690 | )
Allowance for Funds Used During Construction – Equity |  |  | (388 | ) |  |  | (239 | ) |  |  | (948 | ) |  |  | (419 | )
North Dakota Wind Tax Credit Amortization – Net of Federal Taxes |  |  | (259 | ) |  |  | (258 | ) |  |  | (775 | ) |  |  | (774 | )
Research and Development and Other Tax Credits |  |  | (263 | ) |  |  | (612 | ) |  |  | (649 | ) |  |  | (987 | )
Excess Tax Deduction – Equity Method Stock Awards |  |  | - |  |  |  | - |  |  |  | (535 | ) |  |  | (827 | )
Corporate Owned Life Insurance |  |  | (155 | ) |  |  | (50 | ) |  |  | (141 | ) |  |  | (609 | )
Reconciliation and Prior Period Adjustments |  |  | 172 |  |  |  | (688 | ) |  |  | 172 |  |  |  | (722 | )
Other Items – Net |  |  | (40 | ) |  |  | (1 | ) |  |  | (20 | ) |  |  | 30 |
Income Tax Expense |  | $ | 9,097 |  |  | $ | 4,936 |  |  | $ | 18,543 |  |  | $ | 13,907 |
Effective Income Tax Rate |  |  | 20.2 | % |  |  | 16.6 | % |  |  | 19.4 | % |  |  | 17.3 | %
Summary of Income Tax Contingencies [Table Text Block] |
(in thousands) |  | 2020 |  |  | 2019 |
Balance on January 1 |  | $ | 1,488 |  |  | $ | 1,282 |
(Decreases) Increases Related to Tax Positions for Prior Years |  |  | (27 | ) |  |  | 37 |
Increases Related to Tax Positions for Current Year |  |  | 123 |  |  |  | 153 |
Uncertain Positions Resolved During Year |  |  | (586 | ) |  |  | - |
Decrease from the Expiration of Statute of Limitations |  |  | (139 | ) |  |  | (170 | )
Balance on September 30 |  | $ | 859 |  |  | $ | 1,302 |

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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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