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Note 11 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Pension Items [Member]        
Balance     $ (1,624) $ (1,862)
Other comprehensive income (loss) before reclassifications     127 167
Amounts reclassified from accumulated other comprehensive income (loss)     172 160
Net current period other comprehensive income (loss)     299 327
Balance $ (1,325) $ (1,535) (1,325) (1,535)
Gains (Losses) on Cash Flow Hedges [Member]        
Balance     86 29
Other comprehensive income (loss) before reclassifications     (75) 76
Amounts reclassified from accumulated other comprehensive income (loss)     (24) (92)
Net current period other comprehensive income (loss)     (99) (16)
Balance (13) 13 (13) 13
Balance     (1,538) (1,833)
Other comprehensive income (loss) before reclassifications     52 243
Amounts reclassified from accumulated other comprehensive income (loss)     148 68
Net current period other comprehensive income (loss) 117 124 200 311
Balance $ (1,338) $ (1,522) $ (1,338) $ (1,522)