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Note 12 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Beginning balance $ 224,442 $ 190,828 $ 218,590 $ 200,264
Cumulative-effect adjustment for ASU 2018-02 (Note 14)     (875)
Other comprehensive income (loss), net of tax 23 7 61 103
Ending balance 235,753 218,636 235,753 218,636
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     70  
Amounts reclassified from Accumulated other comprehensive loss     8  
Other comprehensive income (loss), net of tax     78  
Ending balance (1,708)   (1,708)  
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     (7)  
Other comprehensive income (loss), net of tax     (17)  
Ending balance (2)   (2)  
AOCI Attributable to Parent [Member]        
Beginning balance (1,733) (1,349) (1,536) (1,445)
Cumulative-effect adjustment for ASU 2018-02 (Note 14)     (235)
Other comprehensive income (loss) before reclassifications     60  
Amounts reclassified from Accumulated other comprehensive loss     1  
Other comprehensive income (loss), net of tax     61  
Ending balance $ (1,710) $ (1,342) $ (1,710) $ (1,342)