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Note 2 - Investments (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Proceeds from Sale, Maturity and Collection of Investments, Total $ 52,582 $ 28,126  
Debt and Equity Securities, Realized Gain (Loss), Total $ 0 $ 0  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 87    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax, Total $ 905,914   $ 2,389,278
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total $ 0   $ 0
Fixed Income Securities [Member]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 53    
Collateralized Mortgage Backed Securities [Member]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 21    
Preferred Stock [Member]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 4    
Corporate Debt Securities [Member]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 2    
Preferred Stock Index Fund [Member]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 2    
Senior Loan Fund [Member]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 1    
Common Stock [Member]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 4