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Note 16 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance $ (1,538) $ (1,833)  
Other comprehensive income before reclassifications (173) 167  
Amounts reclassified from Accumulated other comprehensive loss 228 128  
Net current period adjustments to Other comprehensive income (loss) 55 295 $ (572)
Balance (1,483) (1,538) (1,833)
Defined Benefit Pension Items [Member]      
Balance (1,624) (1,862)  
Other comprehensive income before reclassifications (125) 17  
Amounts reclassified from Accumulated other comprehensive loss 256 221  
Net current period adjustments to Other comprehensive income (loss) 131 238  
Balance (1,493) (1,624) (1,862)
Gains (Losses) on Cash Flow Hedges [Member]      
Balance 86 29  
Other comprehensive income before reclassifications (48) 150  
Amounts reclassified from Accumulated other comprehensive loss (28) (93)  
Net current period adjustments to Other comprehensive income (loss) (76) 57  
Balance $ 10 $ 86 $ 29