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Note 2 - Investments (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Proceeds from Sale, Maturity and Collection of Investments $ 1,862,409 $ 314,111 $ 2,832,149 $ 559,751  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 140,561   $ 140,561   $ 281,031
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 39   39    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities     $ 0   $ 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax   $ 639,766   $ 639,766  
Fixed Income Securities [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 18   18    
Collateralized Mortgage Backed Securities [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 12   12    
Common Stock [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 5   5    
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 1   1    
Senior Loan Fund [Member]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   1