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Note 8 - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Non-operating income [1] $ 1,043 $ 1,015
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]    
Non-operating income [1] (833) (1)
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Total before tax [1] 210 1,014
Tax expense [1] (80) (385)
Net income [1] 130 629
Non-operating income 1,516 2,099
Total before tax 34,928 22,212
Tax expense (13,492) (8,721)
Net income $ 21,436 $ 13,491
[1] Amounts in parentheses indicate debits to profit/loss