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Note 18 - Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Balance $ 14,834  
Foreign currency translation adjustments, net of tax expense of $104 and tax benefit of $18 in 2019 and 2018, respectively 344 $ (52)
Balance 13,431 14,834
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Balance (10,967) (10,915)
Foreign currency translation adjustments, net of tax expense of $104 and tax benefit of $18 in 2019 and 2018, respectively 344 (52)
Net actuarial gain (loss) for the year, net of tax 0 0
Amortization for the year, net of tax 0 0
Balance (10,623) (10,967)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (13,875) (14,636)
Foreign currency translation adjustments, net of tax expense of $104 and tax benefit of $18 in 2019 and 2018, respectively 0 0
Net actuarial gain (loss) for the year, net of tax (64) 276
Amortization for the year, net of tax 511 485
Balance (13,428) (13,875)
AOCI Attributable to Parent [Member]    
Balance (24,842) (25,551)
Foreign currency translation adjustments, net of tax expense of $104 and tax benefit of $18 in 2019 and 2018, respectively 344 (52)
Net actuarial gain (loss) for the year, net of tax (64) 276
Amortization for the year, net of tax 511 485
Balance $ (24,051) $ (24,842)