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Note 15 - Income Taxes - Summary of Components of Income Tax Expense for Continuing Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Federal | $ 2,256 | $ 958 | $ 174
State | 1,064 | 1,342 | (16)
Foreign | 213 | 243 | 439
Total current income tax expense | 3,533 | 2,543 | 597
Federal | 573 | 4,380 | 3,597
State | (464) | (386) | 561
Foreign | (7) | 47 | (17)
Total deferred income tax expense | 102 | 4,041 | 4,141
Total income tax expense | $ 3,635 | $ 6,584 | $ 4,738

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