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Note 19 - Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Balance $ 16,930  
Foreign currency translation adjustments, net of a tax benefit of $18 and tax expense of $267 in 2018 and 2017, respectively (52) $ 419
Balance 14,834 16,930
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Balance (10,915) (11,334)
Foreign currency translation adjustments, net of a tax benefit of $18 and tax expense of $267 in 2018 and 2017, respectively (52) 419
Net actuarial gain for the year, net of tax 0 0
Amortization for the year, net of tax 0 0
Balance (10,967) (10,915)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (14,636) (15,264)
Foreign currency translation adjustments, net of a tax benefit of $18 and tax expense of $267 in 2018 and 2017, respectively 0 0
Net actuarial gain for the year, net of tax 276 205
Amortization for the year, net of tax 485 423
Balance (13,875) (14,636)
AOCI Attributable to Parent [Member]    
Balance (25,551) (26,598)
Foreign currency translation adjustments, net of a tax benefit of $18 and tax expense of $267 in 2018 and 2017, respectively (52) 419
Net actuarial gain for the year, net of tax 276 205
Amortization for the year, net of tax 485 423
Balance $ (24,842) $ (25,551)