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Note 10 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Balance $ 200,264  
Other comprehensive income, net of tax 49 $ 95
Balance 196,267  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (1,436) (1,493)
Other comprehensive income before reclassifications 24 25
Amounts reclassified from Accumulated other comprehensive loss 77
Other comprehensive income, net of tax 24 102
Balance (1,412) (1,391)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Balance (9) 10
Other comprehensive income before reclassifications 23 (12)
Amounts reclassified from Accumulated other comprehensive loss 2 5
Other comprehensive income, net of tax 25 (7)
Balance 16 3
AOCI Attributable to Parent [Member]    
Balance (1,445) (1,483)
Other comprehensive income before reclassifications 47 13
Amounts reclassified from Accumulated other comprehensive loss 2 82
Other comprehensive income, net of tax 49 95
Balance $ (1,396) $ (1,388)