Note 3 - Investments - Maturity Dates for Fixed Maturities and Short-term Investments (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Total, amortized cost	$ 6,278,946	$ 8,953,000
Fixed Maturities and Short Term Investments Excluding the Money Market Funds [Member]
Less than 1 year, amortized cost	350,000	400,000
Less than 1 year, fair value	$ 350,000	$ 400,898
Less than 1 year, percentage of total fair value	5.30%	4.40%
Years 1-5, amortized cost	$ 3,828,690	$ 6,122,513
Years 1-5, fair value	$ 3,831,336	$ 5,986,448
Years 1-5, percentage of total fair value	57.90%	65.80%
Years 5-10, amortized cost	$ 2,354,646	$ 2,731,661
Years 5-10, fair value	$ 2,343,365	$ 2,620,761
Years 5-10, percentage of total fair value	35.40%	28.80%
Due after ten years, amortized cost	$ 95,610	$ 98,468
Due after ten years, fair value	$ 93,948	$ 93,898
Due after ten years, percentage of total fair value	1.40%	1.00%
Total, amortized cost	$ 6,628,946	$ 9,352,642
Total, fair value	$ 6,618,649	$ 9,102,005
Total, percentage of total fair value	100.00%	100.00%