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Note 11 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Beginning balance $ 218,590 $ 200,264
Cumulative-effect adjustment for new standard (875)
Other comprehensive income (loss), net of tax 11 49
Ending balance 220,788 196,267
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning balance (1,551)  
Cumulative-effect adjustment for new standard (235)  
Other comprehensive income (loss) before reclassifications 23  
Amounts reclassified from Accumulated other comprehensive loss 3  
Other comprehensive income (loss), net of tax 26  
Ending balance (1,760)  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Beginning balance 15  
Cumulative-effect adjustment for new standard  
Other comprehensive income (loss) before reclassifications (10)  
Amounts reclassified from Accumulated other comprehensive loss (5)  
Other comprehensive income (loss), net of tax (15)  
Ending balance  
AOCI Attributable to Parent [Member]    
Beginning balance (1,536) (1,445)
Cumulative-effect adjustment for new standard (235)
Other comprehensive income (loss) before reclassifications 13  
Amounts reclassified from Accumulated other comprehensive loss (2)  
Other comprehensive income (loss), net of tax 11  
Ending balance $ (1,760) $ (1,396)