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Note 8 - Comprehensive Income (Loss) - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
NON-OPERATING INCOME $ 384 $ 2,767 $ 650 $ 2,052 $ 282 $ 1,235 $ (10) $ (22) $ 5,853 $ 1,485 $ 1,516
Total before tax                 14,631 17,772 34,928
Tax expense (28,895) 2,169 1,004 1,454 270 2,152 2,442 1,807 24,268 (6,671) (13,492)
NET INCOME $ 31,561 $ 3,446 $ 1,609 $ 2,283 $ 723 $ 3,451 $ 3,992 $ 2,935 38,899 11,101 $ 21,436
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Total before tax [1]                 3,343 167  
Tax expense                 (1,310) [1] (64)  
NET INCOME [1]                 2,033 103  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                      
NON-OPERATING INCOME [1]                 3,385 876  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]                      
NON-OPERATING INCOME [1]                 $ (42) $ (709)  
[1] Amounts in parentheses indicate debits to profit/loss