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Note 15 - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Pension Items [Member]      
Balance $ (1,862) $ (1,275)  
Other comprehensive income (loss) before reclassifications 17 (701)  
Amounts reclassified from accumulated other comprehensive loss 221 114  
Net current period adjustments to other comprehensive income (loss) 238 (587)  
Balance (1,624) (1,862) $ (1,275)
Gains (Losses) on Cash Flow Hedges [Member]      
Balance 29 14  
Other comprehensive income (loss) before reclassifications 150 17  
Amounts reclassified from accumulated other comprehensive loss (93) (2)  
Net current period adjustments to other comprehensive income (loss) 57 15  
Balance 86 29 14
Balance (1,833) (1,261)  
Other comprehensive income (loss) before reclassifications 167 (684)  
Amounts reclassified from accumulated other comprehensive loss 128 112  
Net current period adjustments to other comprehensive income (loss) 295 (572) 1,012
Balance $ (1,538) $ (1,833) $ (1,261)