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Note 11 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Balance     $ 200,264  
Other comprehensive income, net of tax $ 47 $ 95 96 $ 190
Balance 190,828   190,828  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance     (1,436)  
Other comprehensive income before reclassifications     61  
Amounts reclassified from Accumulated other comprehensive loss      
Other comprehensive income, net of tax     61  
Balance (1,375)   (1,375)  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Balance     (9)  
Other comprehensive income before reclassifications     33  
Amounts reclassified from Accumulated other comprehensive loss     2  
Other comprehensive income, net of tax     35  
Balance 26   26  
AOCI Attributable to Parent [Member]        
Balance     (1,445)  
Other comprehensive income before reclassifications     94  
Amounts reclassified from Accumulated other comprehensive loss     2  
Other comprehensive income, net of tax     96  
Balance $ (1,349)   $ (1,349)