Note 15 - Unaudited Condensed Quarterly Financial Data - Quarterly Financial Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net premiums earned (Note 8)	$ 3,207,070	$ 2,815,917	$ 2,862,026	$ 2,463,583	$ 2,907,593	$ 2,554,044	$ 2,535,703	$ 2,135,175	$ 11,348,596	$ 10,132,515
Commission income									5,800,987	5,497,779
Net investment income (Note 4)	122,968	125,491	106,610	123,042	116,501	92,215	87,224	88,469	478,111	384,409
Net realized and unrealized (loss) gain	1,479,208	72,492	775,972	1,747,325	(3,087,054)	567,054	489,346	(161,060)
Total revenues	6,214,378	4,464,267	5,134,292	5,889,754	1,343,258	4,547,665	4,440,502	3,491,564	21,702,691	13,765,531
Net income (loss)	$ 253,901	$ (22,537)	$ 511,444	$ 1,669,711	$ (387,733)	$ 439,455	$ 147,736	$ (315,167)	$ 2,412,519	$ (115,709)
Basic (loss) income per share (in dollars per share)	$ 0.41	$ (0.04)	$ 0.81	$ 2.65	$ (0.60)	$ 0.68	$ 0.23	$ (0.49)	$ 3.83	$ (0.18)
Diluted (loss) income per share (in dollars per share)	$ 0.41	$ (0.04)	$ 0.80	$ 2.64	$ (0.60)	$ 0.68	$ 0.23	$ (0.49)	$ 3.81	$ (0.18)
Financial Service [Member]
Commission income	$ 1,405,132	$ 1,450,367	$ 1,389,684	$ 1,555,804	$ 1,406,218	$ 1,334,352	$ 1,328,229	$ 1,428,980