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Note 9 - Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
United States $ 13,872 $ 37,248 $ 31,246
Current expense:      
United States 13,872 37,248 31,246
Federal 1,581 5,174 4,058
Foreign 1,264 1,087 353
State and local 918 1,086 1,103
Current Income Tax Expense (Benefit), Total 3,763 7,347 5,514
Deferred expense (benefit):      
Federal (565) 60 728
Foreign 147 48 (349)
State and local (668) (58) 165
Deferred Income Tax Expense (Benefit), Total (1,086) 50 544
Income tax expense 2,677 7,397 6,058
UNITED STATES      
United States 6,270 30,973 28,493
Current expense:      
United States 6,270 30,973 28,493
Foreign Countries [Member]      
United States 7,602 6,275 2,753
Current expense:      
United States $ 7,602 $ 6,275 $ 2,753