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Note 12 - Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Balance $ 168,051 $ 176,470
Other comprehensive (loss) income (2,179) 577
Balance 161,832 178,153
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Balance (20,032)  
Other comprehensive (loss) income before reclassifications (2,245)  
Amount reclassified from accumulated other comprehensive income (Loss)  
Other comprehensive (loss) income (2,245)  
Balance (22,277)  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]    
Balance 12  
Other comprehensive (loss) income before reclassifications  
Amount reclassified from accumulated other comprehensive income (Loss)  
Other comprehensive (loss) income  
Balance 12  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (4,045)  
Other comprehensive (loss) income before reclassifications (169)  
Amount reclassified from accumulated other comprehensive income (Loss) [1] 235  
Other comprehensive (loss) income 66  
Balance (3,979)  
AOCI Attributable to Parent [Member]    
Balance (24,065) (24,838)
Other comprehensive (loss) income before reclassifications (2,414)  
Amount reclassified from accumulated other comprehensive income (Loss) 235  
Other comprehensive (loss) income (2,179)  
Balance $ (26,244) $ (24,724)
[1] This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP Plan. This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.