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Note 2 - Investments - Fair Value of Securities in Unrealized Loss Position (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Fair value, less than 12 Months $ 13,304,611 $ 9,764,755
Fair value, 12 months or longer 2,014,666 5,756,123
Fair value 15,319,277 15,520,878
Amortized cost, less than 12 Months 13,528,276 9,825,805
Amortized cost, 12 months or longer 2,037,226 5,787,802
Amortized cost 15,565,502 15,613,607
Unrealized loss, less than 12 Months (223,665) (61,050)
Unrealized loss, 12 months or longer (22,560) (31,679)
Unrealized loss (246,225) (92,729)
US Treasury Securities [Member]    
Fair value, less than 12 Months 300,000
Fair value, 12 months or longer 699,391
Fair value 300,000 699,391
Amortized cost, less than 12 Months 300,082
Amortized cost, 12 months or longer 700,318
Amortized cost 300,082 700,318
Unrealized loss, less than 12 Months (82)
Unrealized loss, 12 months or longer (927)
Unrealized loss (82) (927)
MBS/ABS/CMBS [Member]    
Fair value, less than 12 Months 11,438,192 6,398,581
Fair value, 12 months or longer 2,014,666 5,056,732
Fair value 13,452,858 11,455,313
Amortized cost, less than 12 Months 11,556,312 6,420,488
Amortized cost, 12 months or longer 2,037,226 5,087,484
Amortized cost 13,593,538 11,507,972
Unrealized loss, less than 12 Months (118,120) (21,907)
Unrealized loss, 12 months or longer (22,560) (30,752)
Unrealized loss (140,680) (52,659)
Corporate Debt Securities [Member]    
Fair value, less than 12 Months 1,075,259 1,396,706
Fair value, 12 months or longer
Fair value 1,075,259 1,396,706
Amortized cost, less than 12 Months 1,172,733 1,406,183
Amortized cost, 12 months or longer
Amortized cost 1,172,733 1,406,183
Unrealized loss, less than 12 Months (97,474) (9,477)
Unrealized loss, 12 months or longer
Unrealized loss (97,474) (9,477)
US States and Political Subdivisions Debt Securities [Member]    
Fair value, less than 12 Months 491,160 1,969,468
Fair value, 12 months or longer
Fair value 491,160 1,969,468
Amortized cost, less than 12 Months 499,149 1,999,134
Amortized cost, 12 months or longer
Amortized cost 499,149 1,999,134
Unrealized loss, less than 12 Months (7,989) (29,666)
Unrealized loss, 12 months or longer
Unrealized loss $ (7,989) $ (29,666)