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Note 14 - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Beginning balance, net of tax $ (521,000) $ 3,392,000
Other comprehensive income before reclassifications, net of tax $ 6,770,000 $ 4,332,000
Amounts reclassified from accumulated other comprehensive income, net of tax
Total other comprehensive income, net of tax $ 6,770,000 $ 4,332,000
Ending balance, net of tax 6,249,000 7,724,000
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning balance, net of tax $ (5,041,000) $ (6,299,000)
Other comprehensive income before reclassifications, net of tax
Amounts reclassified from accumulated other comprehensive income, net of tax $ 103,000 $ 168,000
Total other comprehensive income, net of tax 103,000 168,000
Ending balance, net of tax (4,938,000) (6,131,000)
Beginning balance, net of tax (5,562,000) (2,907,000)
Other comprehensive income before reclassifications, net of tax 6,770,000 4,332,000
Amounts reclassified from accumulated other comprehensive income, net of tax 103,000 168,000
Total other comprehensive income, net of tax 6,873,000 4,500,000
Ending balance, net of tax $ 1,311,000 $ 1,593,000