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Note 11 - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Pension Items [Member]        
Balance     $ (1,624) $ (1,862)
Other comprehensive income (loss) before reclassifications     63 111
Amounts reclassified from accumulated other comprehensive income (loss)     136 107
Net current period other comprehensive income (loss)     199 218
Balance $ (1,425) $ (1,644) (1,425) (1,644)
Gains (Losses) on Cash Flow Hedges [Member]        
Balance     86 29
Other comprehensive income (loss) before reclassifications     (86) 48
Amounts reclassified from accumulated other comprehensive income (loss)     (30) (79)
Net current period other comprehensive income (loss)     (116) (31)
Balance (30) (2) (30) (2)
Balance     (1,538) (1,833)
Other comprehensive income (loss) before reclassifications     (23) 159
Amounts reclassified from accumulated other comprehensive income (loss)     106 28
Net current period other comprehensive income (loss) 115 93 83 187
Balance $ (1,455) $ (1,646) $ (1,455) $ (1,646)