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Note 5 - Accumulated Other Comprehensive Loss (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Other Comprehensive Income (Loss), before Reclassifications, before Tax $ (800) $ (412)
Other Comprehensive Income (Loss) before Reclassifications, Tax (209) (139)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 883 941
Reclassification from AOCI, Current Period, Tax (230) (346)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Other Comprehensive Income (Loss), before Reclassifications, before Tax 6,096 876
Other Comprehensive Income (Loss) before Reclassifications, Tax $ 2,384 $ 341