Note 8 - Loans Receivable, Net - Credit Quality Indicators (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Current year	$ 63,240,526		$ 63,240,526
One year before	162,144,966		162,144,966
Two years before	109,519,080		109,519,080
Three years before	48,165,975		48,165,975
Four years before	41,969,753		41,969,753
Prior	116,761,926		116,761,926
Revolving	59,521,563		59,521,563
Loans	601,323,789		601,323,789		$ 560,987,903
Total loans gross write-offs	38,738	$ 11,821	89,558	$ 43,692
Pass [Member]
Loans					439,247,847
Caution [Member]
Loans					105,368,984
Special Mention [Member]
Loans					7,123,873
Substandard [Member]
Loans					9,247,199
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Current year	12,822,828		12,822,828
One year before	51,565,912		51,565,912
Two years before	20,313,829		20,313,829
Three years before	8,806,921		8,806,921
Four years before	3,086,343		3,086,343
Prior	2,657,437		2,657,437
Revolving	4,998,369		4,998,369
Loans	104,251,639		104,251,639		112,793,694
Current year, writen off			0
One year before gross write-offs			0
Two years before gross write-offs			1,270
Three years before gross write-offs			0
Four years before gross write-offs			0
Prior gross write-offs			0
Revolving gross write-offs			0
Total loans gross write-offs	1,270	(0)	1,270	(0)
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Current year	10,417,314		10,417,314
One year before	33,771,809		33,771,809
Two years before	18,509,413		18,509,413
Three years before	5,202,965		5,202,965
Four years before	740,273		740,273
Prior	1,593,668		1,593,668
Revolving	4,998,369		4,998,369
Loans	75,233,811		75,233,811		91,564,058
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Caution [Member]
Current year	2,405,514		2,405,514
One year before	17,764,334		17,764,334
Two years before	1,552,647		1,552,647
Three years before	3,464,157		3,464,157
Four years before	424,094		424,094
Prior	485,558		485,558
Revolving	0		0
Loans	26,096,304		26,096,304		18,837,894
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Current year	0		0
One year before	29,769		29,769
Two years before	0		0
Three years before	0		0
Four years before	1,278,716		1,278,716
Prior	459,724		459,724
Revolving	0		0
Loans	1,768,209		1,768,209		2,013,824
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Current year	0		0
One year before	0		0
Two years before	251,769		251,769
Three years before	139,799		139,799
Four years before	643,260		643,260
Prior	118,487		118,487
Revolving	0		0
Loans	1,153,315		1,153,315		377,918
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member]
Current year	22,811,290		22,811,290
One year before	39,627,780		39,627,780
Two years before	18,470,147		18,470,147
Three years before	16,439,964		16,439,964
Four years before	5,874,674		5,874,674
Prior	32,324,016		32,324,016
Revolving	10,137,556		10,137,556
Loans	145,685,427		145,685,427		110,056,973
Current year, writen off			0
One year before gross write-offs			0
Two years before gross write-offs			0
Three years before gross write-offs			0
Four years before gross write-offs			0
Prior gross write-offs			0
Revolving gross write-offs			0
Total loans gross write-offs	(0)	(0)	0	(0)
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Pass [Member]
Current year	14,138,634		14,138,634
One year before	30,646,464		30,646,464
Two years before	11,486,272		11,486,272
Three years before	14,394,653		14,394,653
Four years before	4,187,015		4,187,015
Prior	24,570,986		24,570,986
Revolving	10,121,616		10,121,616
Loans	109,545,640		109,545,640		84,028,037
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Caution [Member]
Current year	7,112,242		7,112,242
One year before	8,822,433		8,822,433
Two years before	5,453,105		5,453,105
Three years before	1,733,323		1,733,323
Four years before	1,637,317		1,637,317
Prior	4,980,282		4,980,282
Revolving	15,940		15,940
Loans	29,754,642		29,754,642		22,372,649
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Special Mention [Member]
Current year	1,560,414		1,560,414
One year before	158,883		158,883
Two years before	905,331		905,331
Three years before	311,988		311,988
Four years before	0		0
Prior	248,084		248,084
Revolving	0		0
Loans	3,184,700		3,184,700		887,874
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Substandard [Member]
Current year	0		0
One year before	0		0
Two years before	625,439		625,439
Three years before	0		0
Four years before	50,342		50,342
Prior	2,524,664		2,524,664
Revolving	0		0
Loans	3,200,445		3,200,445		2,768,413
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Current year	15,571,355		15,571,355
One year before	52,910,207		52,910,207
Two years before	56,489,381		56,489,381
Three years before	20,314,939		20,314,939
Four years before	31,814,682		31,814,682
Prior	80,391,996		80,391,996
Revolving	2,420,272		2,420,272
Loans	259,912,832		259,912,832		252,154,475
Current year, writen off			0
One year before gross write-offs			0
Two years before gross write-offs			0
Three years before gross write-offs			0
Four years before gross write-offs			0
Prior gross write-offs			0
Revolving gross write-offs			0
Total loans gross write-offs	(0)	(0)	0	(0)
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Pass [Member]
Current year	7,539,285		7,539,285
One year before	46,985,388		46,985,388
Two years before	51,586,533		51,586,533
Three years before	13,254,437		13,254,437
Four years before	24,446,966		24,446,966
Prior	55,660,664		55,660,664
Revolving	2,320,461		2,320,461
Loans	201,793,734		201,793,734		196,063,300
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Caution [Member]
Current year	7,819,570		7,819,570
One year before	5,013,012		5,013,012
Two years before	4,382,223		4,382,223
Three years before	6,596,059		6,596,059
Four years before	7,131,281		7,131,281
Prior	16,734,598		16,734,598
Revolving	0		0
Loans	47,676,743		47,676,743		47,821,422
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Current year	212,500		212,500
One year before	840,401		840,401
Two years before	461,021		461,021
Three years before	464,443		464,443
Four years before	236,435		236,435
Prior	3,276,765		3,276,765
Revolving	99,811		99,811
Loans	5,591,376		5,591,376		3,270,916
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Substandard [Member]
Current year	0		0
One year before	71,406		71,406
Two years before	59,604		59,604
Three years before	0		0
Four years before	0		0
Prior	4,719,969		4,719,969
Revolving	0		0
Loans	4,850,979		4,850,979		4,998,837
Commercial and Agricultural Loans [Member]
Current year	5,957,953		5,957,953
One year before	10,332,095		10,332,095
Two years before	10,723,829		10,723,829
Three years before	856,356		856,356
Four years before	589,932		589,932
Prior	1,048,180		1,048,180
Revolving	4,756,551		4,756,551
Loans	34,264,896		34,264,896		30,647,975
Current year, writen off			0
One year before gross write-offs			0
Two years before gross write-offs			15,880
Three years before gross write-offs			0
Four years before gross write-offs			0
Prior gross write-offs			0
Revolving gross write-offs			0
Total loans gross write-offs	(0)	(0)	15,880	(0)
Commercial and Agricultural Loans [Member] | Pass [Member]
Current year	2,333,570		2,333,570
One year before	8,662,633		8,662,633
Two years before	8,755,005		8,755,005
Three years before	754,806		754,806
Four years before	554,676		554,676
Prior	738,092		738,092
Revolving	3,941,547		3,941,547
Loans	25,740,329		25,740,329		25,383,994
Commercial and Agricultural Loans [Member] | Caution [Member]
Current year	3,330,166		3,330,166
One year before	1,610,930		1,610,930
Two years before	1,830,633		1,830,633
Three years before	75,513		75,513
Four years before	22,353		22,353
Prior	139,119		139,119
Revolving	728,104		728,104
Loans	7,736,818		7,736,818		4,593,283
Commercial and Agricultural Loans [Member] | Special Mention [Member]
Current year	294,217		294,217
One year before	36,424		36,424
Two years before	122,193		122,193
Three years before	15,321		15,321
Four years before	0		0
Prior	100,055		100,055
Revolving	0		0
Loans	568,210		568,210		371,071
Commercial and Agricultural Loans [Member] | Substandard [Member]
Current year	0		0
One year before	22,108		22,108
Two years before	15,998		15,998
Three years before	10,716		10,716
Four years before	12,903		12,903
Prior	70,914		70,914
Revolving	86,900		86,900
Loans	219,539		219,539		299,627
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Three years before	0		0
Four years before	0		0
Prior	0		0
Revolving	32,367,179		32,367,179
Loans	32,367,179		32,367,179		31,736,676
Current year, writen off			0
One year before gross write-offs			0
Two years before gross write-offs			0
Three years before gross write-offs			0
Four years before gross write-offs			0
Prior gross write-offs			0
Revolving gross write-offs			1,488
Total loans gross write-offs	1,488	(0)	1,488	(0)
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Pass [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Three years before	0		0
Four years before	0		0
Prior	0		0
Revolving	26,752,709		26,752,709
Loans	26,752,709		26,752,709		25,693,252
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Caution [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Three years before	0		0
Four years before	0		0
Prior	0		0
Revolving	4,512,811		4,512,811
Loans	4,512,811		4,512,811		5,018,419
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Special Mention [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Three years before	0		0
Four years before	0		0
Prior	0		0
Revolving	450,225		450,225
Loans	450,225		450,225		401,550
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Substandard [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Three years before	0		0
Four years before	0		0
Prior	0		0
Revolving	651,434		651,434
Loans	651,434		651,434		623,455
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Current year	6,077,100		6,077,100
One year before	7,708,972		7,708,972
Two years before	3,521,894		3,521,894
Three years before	1,747,795		1,747,795
Four years before	604,122		604,122
Prior	340,297		340,297
Revolving	4,841,636		4,841,636
Loans	24,841,816		24,841,816		23,598,110
Current year, writen off			0
One year before gross write-offs			18,658
Two years before gross write-offs			1,633
Three years before gross write-offs			0
Four years before gross write-offs			0
Prior gross write-offs			0
Revolving gross write-offs			50,629
Total loans gross write-offs	35,980	$ 11,821	70,920	$ 43,692
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Pass [Member]
Current year	4,468,903		4,468,903
One year before	4,923,483		4,923,483
Two years before	2,195,606		2,195,606
Three years before	1,043,745		1,043,745
Four years before	292,347		292,347
Prior	255,949		255,949
Revolving	4,540,877		4,540,877
Loans	17,720,910		17,720,910		16,515,206
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Caution [Member]
Current year	1,549,087		1,549,087
One year before	2,614,321		2,614,321
Two years before	1,217,032		1,217,032
Three years before	648,313		648,313
Four years before	283,610		283,610
Prior	77,027		77,027
Revolving	279,655		279,655
Loans	6,669,045		6,669,045		6,725,317
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Special Mention [Member]
Current year	59,110		59,110
One year before	135,813		135,813
Two years before	0		0
Three years before	0		0
Four years before	0		0
Prior	0		0
Revolving	6,285		6,285
Loans	201,208		201,208		178,638
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Substandard [Member]
Current year	0		0
One year before	35,355		35,355
Two years before	109,256		109,256
Three years before	55,737		55,737
Four years before	28,165		28,165
Prior	7,321		7,321
Revolving	14,819		14,819
Loans	$ 250,653		$ 250,653		$ 178,949