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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
NON-OPERATING INCOME $ 282 $ 1,235 $ (10) $ (22) $ 1,131 $ (132) $ 272 $ 245 $ 1,485 $ 1,516 $ 2,099
Total before tax                 17,772 34,928 22,212
Tax expense 270 2,152 2,442 1,807 2,048 3,567 4,471 3,406 (6,671) (13,492) (8,721)
NET INCOME $ 723 $ 3,451 $ 3,992 $ 2,935 $ 3,233 $ 5,795 $ 7,039 $ 5,369 11,101 21,436 $ 13,491
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Total before tax [1]                 167 210  
Tax expense                 (64) [1] (80)  
NET INCOME [1]                 103 130  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                      
NON-OPERATING INCOME [1]                 876 1,043  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]                      
NON-OPERATING INCOME [1]                 $ (709) $ (833)  
[1] Amounts in parentheses indicate debits to profit/loss