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Note 18 - Segment of Business - Summary of Reportable Segments Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Electric operations(i) $ 90,914 $ 161,194 $ 200,586 $ 349,528  
Operating Expense 98,200 138,950 205,139 298,051  
Income (loss) from operations (7,286) 22,244 (4,553) 51,477  
Depreciation 13,649 17,169 29,092 35,145  
Assets 595,169 599,889 595,169 599,889 $ 589,780
Capital Expenditures 13,170 17,128 28,044 30,610  
Revenue 90,914 161,194 200,586 349,528  
Delivered energy 1,267 1,603 2,554 2,943  
Electric Operations [Member]          
Electric operations(i) [1] 57,020 71,103 115,932 163,597  
Operating Expense 50,232 61,847 93,897 135,636  
Income (loss) from operations 6,788 9,256 22,035 27,961  
Depreciation 4,698 4,675 9,395 9,350  
Assets 220,511 216,665 220,511 216,665  
Capital Expenditures 5,277 2,683 11,519 3,526  
Revenue [1] 57,020 71,103 115,932 163,597  
Amortization of contract liability 12,080 19,555 24,868 52,902  
Electric Operations [Member] | Energy Capacity [Member]          
Electric operations(i) 16,873 17,155 28,646 33,125  
Revenue 16,873 17,155 28,646 33,125  
Electric Operations [Member] | Delivered Energy [Member]          
Delivered energy 27,893 34,307 62,087 77,382  
Electric Operations [Member] | Other Operating Revenue [Member]          
Delivered energy 174 86 331 188  
Coal Operations [Member]          
Electric operations(i) 46,429 113,098 113,299 208,371  
Operating Expense 57,750 86,735 136,077 168,920  
Income (loss) from operations (11,321) 26,363 (22,778) 39,451  
Depreciation 8,930 12,466 19,658 25,741  
Assets 367,807 387,653 367,807 387,653  
Capital Expenditures 7,560 14,445 16,192 27,084  
Revenue 46,429 113,098 113,299 208,371  
Corporate Segment and Other Operating Segment [Member]          
Electric operations(i) (12,535) (23,007) (28,645) (22,440)  
Operating Expense (9,782) (9,632) (24,835) (6,505)  
Income (loss) from operations (2,753) (13,375) (3,810) (15,935)  
Depreciation 21 28 39 54  
Assets 6,851 (4,429) 6,851 (4,429)  
Capital Expenditures 333 0 333 0  
Revenue $ (12,535) $ (23,007) $ (28,645) $ (22,440)  
[1] Electric operations revenue as of each period presented were comprised of the components noted below (in thousands)