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Note 17 - Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Balance $ 14,775  
Currency translation adjustments, net of tax (593) $ (224)
Balance 19,286 14,775
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Balance (10,847) (10,623)
Currency translation adjustments, net of tax (593) (224)
Net actuarial loss for the year, net of tax 0 0
Amortization for the year, net of tax 0 0
Balance (11,440) (10,847)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (13,851) (13,428)
Currency translation adjustments, net of tax 0 0
Net actuarial loss for the year, net of tax 1,684 (1,054)
Amortization for the year, net of tax 613 631
Balance (11,554) (13,851)
AOCI Attributable to Parent [Member]    
Balance (24,698) (24,051)
Currency translation adjustments, net of tax (593) (224)
Net actuarial loss for the year, net of tax 1,684 (1,054)
Amortization for the year, net of tax 613 631
Balance $ (22,994) $ (24,698)