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Note 4 - Debt and Equity Securities (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Collateralized By Commercial Real Estate [Member] | Collateralized Mortgage Obligations [Member]          
Mortgage Backed Securities Available for Sale Fair Value $ 400,000   $ 400,000   $ 7,700,000
Mortgage Backed Securities Available for Sale Amortized Cost 400,000   400,000   7,700,000
Proceeds from Sale of Available-for-sale Securities 0 $ 138,000,000 64,600,000 $ 163,000,000  
Trading Securities $ 0   0   0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities     $ 0   $ 0