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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Balance     $ 200,264  
Other comprehensive income, net of tax $ 7 $ 105 103 $ 295
Balance 218,636   218,636  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance     (1,436)  
Other comprehensive income before reclassifications     84  
Amounts reclassified from Accumulated other comprehensive loss      
Other comprehensive income, net of tax     84  
Balance (1,352)   (1,352)  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Balance     (9)  
Other comprehensive income before reclassifications     26  
Amounts reclassified from Accumulated other comprehensive loss     (7)  
Other comprehensive income, net of tax     19  
Balance 10   10  
AOCI Attributable to Parent [Member]        
Balance     (1,445)  
Other comprehensive income before reclassifications     110  
Amounts reclassified from Accumulated other comprehensive loss     (7)  
Other comprehensive income, net of tax     103  
Balance $ (1,342)   $ (1,342)