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Note 11 - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Pension Items [Member]        
Balance     $ (1,862) $ (1,275)
Other comprehensive income (loss) before reclassifications     167 107
Amounts reclassified from accumulated other comprehensive income (loss)     160 84
Net current period other comprehensive income (loss)     327 191
Balance $ (1,535) $ (1,084) (1,535) (1,084)
Gains (Losses) on Cash Flow Hedges [Member]        
Balance     29 14
Other comprehensive income (loss) before reclassifications     76 1
Amounts reclassified from accumulated other comprehensive income (loss)     (92) $ (1)
Net current period other comprehensive income (loss)     (16)
Balance 13 14 13 $ 14
Balance     (1,833) (1,261)
Other comprehensive income (loss) before reclassifications     243 108
Amounts reclassified from accumulated other comprehensive income (loss)     68 83
Net current period other comprehensive income (loss) 124 108 311 191
Balance $ (1,522) $ (1,070) $ (1,522) $ (1,070)