Note 2 - Investments - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Investments (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Cost or Amortized Cost	$ 71,863,138	$ 70,615,724
Debt Securities, Gross Unrealized Gains	264,997
Debt Securities, Gross Unrealized Losses	(5,321,918)	(5,704,466)
Investments in available-for-sale securities, at fair value	66,806,217	65,316,077
Debt Securities, Gross Unrealized Gain		404,819
US Treasury Securities [Member]
Cost or Amortized Cost	786,260	993,805
Debt Securities, Gross Unrealized Gains	0
Debt Securities, Gross Unrealized Losses	(59,515)	(5,031)
Investments in available-for-sale securities, at fair value	726,745	1,025,087
Debt Securities, Gross Unrealized Gain		36,313
Corporate Debt Securities [Member]
Cost or Amortized Cost	19,286,073	19,018,738
Debt Securities, Gross Unrealized Gains	3,993
Debt Securities, Gross Unrealized Losses	(2,918,435)	(3,150,382)
Investments in available-for-sale securities, at fair value	16,371,631	15,869,078
Debt Securities, Gross Unrealized Gain		722
US States and Political Subdivisions Debt Securities [Member]
Cost or Amortized Cost	6,218,178	6,228,636
Debt Securities, Gross Unrealized Gains	7,116
Debt Securities, Gross Unrealized Losses	(596,541)	(808,227)
Investments in available-for-sale securities, at fair value	5,628,753	5,420,409
Debt Securities, Gross Unrealized Gain		0
Redeemable Preferred Stock [Member]
Cost or Amortized Cost	3,627,683	3,875,526
Debt Securities, Gross Unrealized Gains	0
Debt Securities, Gross Unrealized Losses	(411,828)	(519,911)
Investments in available-for-sale securities, at fair value	3,215,855	3,355,615
Debt Securities, Gross Unrealized Gain		0
Term Loans [Member]
Cost or Amortized Cost	18,191,123	18,086,124
Debt Securities, Gross Unrealized Gains	31,348
Debt Securities, Gross Unrealized Losses	(157,149)	(146,395)
Investments in available-for-sale securities, at fair value	18,065,322	18,149,718
Debt Securities, Gross Unrealized Gain		209,989
Collateralized Mortgage-Backed Securities [Member]
Cost or Amortized Cost	23,753,821	22,412,895
Debt Securities, Gross Unrealized Gains	222,540
Debt Securities, Gross Unrealized Losses	(1,178,450)	(1,074,520)
Investments in available-for-sale securities, at fair value	$ 22,797,911	21,496,170
Debt Securities, Gross Unrealized Gain		$ 157,795

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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