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Note 11 - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Defined Benefit Pension Items [Member]        
Balance, December     $ (1,862) $ (1,275)
Other comprehensive income (loss) before reclassifications     111 73
Amounts reclassified from accumulated other comprehensive income (loss)     107 55
Net current period other comprehensive income (loss)     218 128
Balance, June $ (1,644) $ (1,147) (1,644) (1,147)
Gains (Losses) on Cash Flow Hedges [Member]        
Balance, December     29 14
Other comprehensive income (loss) before reclassifications     48 (32)
Amounts reclassified from accumulated other comprehensive income (loss)     (79) (13)
Net current period other comprehensive income (loss)     (31) (45)
Balance, June (2) (31) (2) (31)
Balance, December     (1,833) (1,261)
Other comprehensive income (loss) before reclassifications     159 41
Amounts reclassified from accumulated other comprehensive income (loss)     28 42
Net current period other comprehensive income (loss) 93 17 187 83
Balance, June $ (1,646) $ (1,178) $ (1,646) $ (1,178)