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Note 8 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Beginning balance $ 209,213  
Ending balance 204,169  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning balance (1,493) $ (1,624)
Other comprehensive income (loss) before reclassifications 76 63
Amounts reclassified from Accumulated other comprehensive loss 128 136
Net current period adjustments to Other comprehensive income 204 199
Ending balance (1,289) (1,425)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Beginning balance 10 86
Other comprehensive income (loss) before reclassifications (15) (86)
Amounts reclassified from Accumulated other comprehensive loss 1 (30)
Net current period adjustments to Other comprehensive income (14) (116)
Ending balance (4) (30)
AOCI Attributable to Parent [Member]    
Beginning balance (1,483) (1,538)
Other comprehensive income (loss) before reclassifications 61 (23)
Amounts reclassified from Accumulated other comprehensive loss 129 106
Net current period adjustments to Other comprehensive income 190 83
Ending balance $ (1,293) $ (1,455)