Note 8 - Loans Receivable, Net - Allowance for Credit Loss (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jan. 01, 2023	Dec. 31, 2022
Balance	$ 12,126,810	$ 11,128,963	$ 11,177,753	$ 11,087,164
Provision for credit losses	161,000		326,000
Charge-Offs	(38,738)	(11,821)	(89,558)	(43,692)
Recoveries	34,253	80,812	84,936	154,482
Balance	12,283,325	11,197,954	12,283,325	11,197,954
Provision for Credit Losses	221,000	0	221,000	0
Individually evaluated for impairment						$ 0
Collectively evaluated for impairment						11,177,753
Held for investment, allowance for credit loss	12,283,325	11,197,954	12,283,325	11,197,954		11,177,753
Individually evaluated for impairment						5,565,878
Collectively evaluated for impairment						555,422,025
Loans	601,323,789		601,323,789			560,987,903
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance			784,194
Held for investment, allowance for credit loss					$ 784,000	784,194
Unfunded Loan Commitment [Member]
Beginning Balance	1,048,614		0
Reversal of provision for unfunded commitments	60,000		(105,000)
Unfunded Loan Commitment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning Balance			1,213,614
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Balance	2,345,958	2,336,583	2,323,397	2,401,196
Provision for credit losses	(149,018)		(394,154)
Charge-Offs	(1,270)	0	(1,270)	0
Recoveries	5,180	6,961	9,140	15,563
Balance	2,200,850	2,104,386	2,200,850	2,104,386
Provision for Credit Losses		(239,158)		(312,373)
Individually evaluated for impairment						0
Collectively evaluated for impairment						2,323,397
Held for investment, allowance for credit loss	2,200,850	2,104,386	2,200,850	2,104,386		2,323,397
Individually evaluated for impairment						114,630
Collectively evaluated for impairment						112,679,064
Loans	104,251,639		104,251,639			112,793,694
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance			263,737
Held for investment, allowance for credit loss						263,737
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member]
Balance	3,072,377	1,628,316	2,124,835	1,663,423
Provision for credit losses	182,914		660,177
Charge-Offs	0	0	0	0
Recoveries	5,600	18,220	14,000	27,931
Balance	3,260,891	1,870,696	3,260,891	1,870,696
Provision for Credit Losses		224,160		179,342
Individually evaluated for impairment						0
Collectively evaluated for impairment						2,124,835
Held for investment, allowance for credit loss	3,260,891	1,870,696	3,260,891	1,870,696		2,124,835
Individually evaluated for impairment						1,089,308
Collectively evaluated for impairment						108,967,665
Loans	145,685,427		145,685,427			110,056,973
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance			461,879
Held for investment, allowance for credit loss						461,879
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Balance	4,263,822	4,932,948	4,804,282	4,832,440
Provision for credit losses	158,167		(46,817)
Charge-Offs	0	0	0	0
Recoveries	5,017	30,498	10,033	49,479
Balance	4,427,006	4,736,314	4,427,006	4,736,314
Provision for Credit Losses		(227,132)		(145,605)
Individually evaluated for impairment						0
Collectively evaluated for impairment						4,804,282
Held for investment, allowance for credit loss	4,427,006	4,736,314	4,427,006	4,736,314		4,804,282
Individually evaluated for impairment						4,281,702
Collectively evaluated for impairment						247,872,773
Loans	259,912,832		259,912,832			252,154,475
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance			(340,492)
Held for investment, allowance for credit loss						(340,492)
Commercial and Agricultural Loans [Member]
Balance	1,130,753	1,242,919	874,092	1,241,828
Provision for credit losses	(35,144)		119,645
Charge-Offs	0	0	(15,880)	0
Recoveries	6,461	1,495	11,761	24,828
Balance	1,102,070	1,403,818	1,102,070	1,403,818
Provision for Credit Losses		159,404		137,162
Individually evaluated for impairment						0
Collectively evaluated for impairment						874,092
Held for investment, allowance for credit loss	1,102,070	1,403,818	1,102,070	1,403,818		874,092
Individually evaluated for impairment						31,446
Collectively evaluated for impairment						30,616,529
Loans	34,264,896		34,264,896			30,647,975
Commercial and Agricultural Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance			112,452
Held for investment, allowance for credit loss						112,452
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Balance	671,526	555,403	598,807	517,512
Provision for credit losses	(20,087)		(76,820)
Charge-Offs	(1,488)	0	(1,488)	0
Recoveries	4,327	4,877	26,231	7,586
Balance	654,278	606,847	654,278	606,847
Provision for Credit Losses		46,567		81,749
Individually evaluated for impairment						0
Collectively evaluated for impairment						598,807
Held for investment, allowance for credit loss	654,278	606,847	654,278	606,847		598,807
Individually evaluated for impairment						48,792
Collectively evaluated for impairment						31,687,884
Loans	32,367,179		32,367,179			31,736,676
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance			107,548
Held for investment, allowance for credit loss						107,548
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Balance	642,374	432,794	452,340	430,765
Provision for credit losses	24,168		63,969
Charge-Offs	(35,980)	(11,821)	(70,920)	(43,692)
Recoveries	7,668	18,761	13,771	29,095
Balance	638,230	475,893	638,230	475,893
Provision for Credit Losses		36,159		59,725
Individually evaluated for impairment						0
Collectively evaluated for impairment						452,340
Held for investment, allowance for credit loss	638,230	$ 475,893	638,230	$ 475,893		452,340
Individually evaluated for impairment						0
Collectively evaluated for impairment						23,598,110
Loans	$ 24,841,816		24,841,816			23,598,110
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance			$ 179,070
Held for investment, allowance for credit loss						$ 179,070