Note 2 - Investments - Schedule of Cost or Amortized cost and Estimated Fair Values of Investments (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Amortized Cost	$ 96,725,639	$ 88,348,415
Debt Securities, Available-for-sale, Total	103,318,485	92,087,572
Gross Unrealized Gains	6,839,071	3,831,886
Gross Unrealized Losses	(246,225)	(92,729)
US Treasury Securities [Member]
Amortized Cost	1,352,935	800,462
Debt Securities, Available-for-sale, Total	1,390,344	800,219
Gross Unrealized Gains	37,491	684
Gross Unrealized Losses	(82)	(927)
MBS/ABS/CMBS [Member]
Amortized Cost	38,843,607	33,802,911
Debt Securities, Available-for-sale, Total	40,057,464	34,290,995
Gross Unrealized Gains	1,354,537	540,743
Gross Unrealized Losses	(140,680)	(52,659)
Corporate Debt Securities [Member]
Amortized Cost	38,295,706	39,442,202
Debt Securities, Available-for-sale, Total	42,339,992	41,915,103
Gross Unrealized Gains	4,141,760	2,482,378
Gross Unrealized Losses	(97,474)	(9,477)
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	18,017,586	14,302,840
Debt Securities, Available-for-sale, Total	19,297,986	15,081,255
Gross Unrealized Gains	1,288,389	808,081
Gross Unrealized Losses	(7,989)	$ (29,666)
Redeemable Preferred Stock [Member]
Amortized Cost	215,805
Debt Securities, Available-for-sale, Total	232,699
Gross Unrealized Gains	16,894
Gross Unrealized Losses

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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