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Note 18 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Beginning balance $ 200,264 $ 209,213 $ 217,560
Other comprehensive income (loss), net of tax (91) 38 55
Ending balance 218,590 200,264 209,213
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Beginning balance (1,436)    
Other comprehensive income (loss) before reclassifications (66)    
Amounts reclassified from Accumulated other comprehensive loss (49)    
Other comprehensive income (loss), net of tax (115)    
Ending balance (1,551) (1,436)  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Beginning balance (9)    
Other comprehensive income (loss) before reclassifications 36    
Amounts reclassified from Accumulated other comprehensive loss (12)    
Other comprehensive income (loss), net of tax 24    
Ending balance 15 (9)  
AOCI Attributable to Parent [Member]      
Beginning balance (1,445) (1,483) (1,538)
Other comprehensive income (loss) before reclassifications (30)    
Amounts reclassified from Accumulated other comprehensive loss (61)    
Other comprehensive income (loss), net of tax (91)    
Ending balance $ (1,536) $ (1,445) $ (1,483)