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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Balance $ 161,832 $ 178,153 $ 168,051 $ 176,470
Other comprehensive income (loss) 742 (797) (1,437) (220)
Balance 167,928 180,276 167,928 180,276
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance     (20,032)  
Other comprehensive loss before reclassifications     (1,568)  
Amount reclassified from accumulated other comprehensive loss     0  
Other comprehensive income (loss)     (1,568)  
Balance (21,600)   (21,600)  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Balance     12  
Other comprehensive loss before reclassifications     (1)  
Amount reclassified from accumulated other comprehensive loss     0  
Other comprehensive income (loss)     (1)  
Balance 11   11  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance     (4,045)  
Other comprehensive loss before reclassifications     (37)  
Amount reclassified from accumulated other comprehensive loss [1]     169  
Other comprehensive income (loss)     132  
Balance (3,913)   (3,913)  
AOCI Attributable to Parent [Member]        
Balance (26,244) (24,724) (24,065) (24,838)
Other comprehensive loss before reclassifications     (1,606)  
Amount reclassified from accumulated other comprehensive loss     169  
Other comprehensive income (loss)     (1,437)  
Balance $ (25,502) $ (25,521) $ (25,502) $ (25,521)
[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.