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Note 3 - Investments (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Proceeds from Sale, Maturity and Collection of Investments $ 4,688,796 $ 204,422 $ 7,520,945 $ 764,173  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 71   71    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 154,457   $ 154,457   $ 281,031
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities     0   $ 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax $ 446,663   $ 446,663    
Fixed Income Securities [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 51   51    
Collateralized Mortgage Backed Securities [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 14   14    
Common Stock [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   1    
Corporate Debt Securities [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2   2    
Preferred Stock [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2   2    
Senior Loan Fund [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   1