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Note 8 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Beginning balance $ 209,213  
Ending balance 205,687  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning balance (1,493) $ (1,624)
Other comprehensive income (loss) before reclassifications 25 33
Amounts reclassified from Accumulated other comprehensive loss 77 67
Net current period adjustments to Other comprehensive income (loss) 102 100
Ending balance (1,391) (1,524)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Beginning balance 10 86
Other comprehensive income (loss) before reclassifications (12) (86)
Amounts reclassified from Accumulated other comprehensive loss 5 (46)
Net current period adjustments to Other comprehensive income (loss) (7) (132)
Ending balance 3 (46)
AOCI Attributable to Parent [Member]    
Beginning balance (1,483) (1,538)
Other comprehensive income (loss) before reclassifications 13 (53)
Amounts reclassified from Accumulated other comprehensive loss 82 21
Net current period adjustments to Other comprehensive income (loss) 95 (32)
Ending balance $ (1,388) $ (1,570)