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Note 18 - Condensed Financial Statements of Parent Company (Details Textual) - 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
Gain (Loss) on Sale of Investments                 $ 199 $ 168
Income Tax Expense (Benefit) $ 538 $ 910 $ 696 $ 730 $ 857 $ 607 $ 790 $ 858 2,874 3,112 3,443
Parent Company [Member]                      
Gain (Loss) on Sale of Investments                 207 168
Income Tax Expense (Benefit)                 67 60 $ 3
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Parent Company [Member]                      
Gain (Loss) on Sale of Investments                 199 168  
Income Tax Expense (Benefit)                 $ 70 $ 57