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Note 14 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Beginning balance, net of tax $ 7,923,000 $ 2,211,000 $ (521,000) $ 3,392,000
Other comprehensive income (loss) before reclassifications, net of tax (2,942,000) 3,943,000 6,852,000 2,798,000
Amounts reclassified from accumulated other comprehensive income, net of tax (58,000) (1,350,000) (94,000)
Total other comprehensive income (loss), net of tax (2,942,000) 3,885,000 5,502,000 2,704,000
Ending balance, net of tax 4,981,000 6,096,000 4,981,000 6,096,000
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Beginning balance, net of tax (4,835,000) (5,967,000) (5,041,000) (6,299,000)
Other comprehensive income (loss) before reclassifications, net of tax
Amounts reclassified from accumulated other comprehensive income, net of tax 103,000 167,000 309,000 499,000
Total other comprehensive income (loss), net of tax 103,000 167,000 309,000 499,000
Ending balance, net of tax (4,732,000) (5,800,000) (4,732,000) (5,800,000)
Beginning balance, net of tax 3,088,000 (3,756,000) (5,562,000) (2,907,000)
Other comprehensive income (loss) before reclassifications, net of tax (2,942,000) 3,943,000 6,852,000 2,798,000
Amounts reclassified from accumulated other comprehensive income, net of tax 103,000 109,000 (1,041,000) 405,000
Total other comprehensive income (loss), net of tax (2,839,000) 4,052,000 5,811,000 3,203,000
Ending balance, net of tax $ 249,000 $ 296,000 $ 249,000 $ 296,000