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Note 12 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Beginning balance $ 220,788 $ 196,267 $ 218,590 $ 200,264
Cumulative-effect adjustment for ASU 2018-02 (Note 14)     (875)
Other comprehensive income (loss), net of tax 27 47 38 96
Ending balance 224,442 190,828 224,442 190,828
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Beginning balance     (1,551)  
Cumulative-effect adjustment for ASU 2018-02 (Note 14)     (235)  
Other comprehensive income (loss) before reclassifications     47  
Amounts reclassified from Accumulated other comprehensive loss     6  
Other comprehensive income (loss), net of tax     53  
Ending balance (1,733)   (1,733)  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Beginning balance     15  
Cumulative-effect adjustment for ASU 2018-02 (Note 14)      
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 (1,760) (1,396) (1,536) (1,445)
Cumulative-effect adjustment for ASU 2018-02 (Note 14)     (235)
Other comprehensive income (loss) before reclassifications     37  
Amounts reclassified from Accumulated other comprehensive loss     1  
Other comprehensive income (loss), net of tax     38  
Ending balance $ (1,733) $ (1,349) $ (1,733) $ (1,349)