Note 24 - Unaudited Quarterly Operating Results - Quarterly Financial Data (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest income	$ 10,170,275	$ 10,858,812	$ 10,189,659	$ 9,976,604	$ 9,943,705	$ 9,968,256	$ 10,159,058	$ 10,798,857	$ 41,195,350	$ 40,869,876	$ 45,226,503
Interest expense	1,157,218	1,468,447	1,828,156	2,071,133	2,151,524	2,236,743	2,136,409	3,086,525	6,524,954	9,611,201	13,535,014
Net interest income	9,013,057	9,390,365	8,361,503	7,905,471	7,792,181	7,731,513	8,022,649	7,712,332	34,670,396	31,258,675	31,691,489
Provision for Loan Losses	0	100,000	300,000	400,000	1,400,000	950,000	750,000	500,000	800,000	3,600,000	200,000
Net gain on loans and investment securities	1,473,675	4,166,966	1,511,860	1,567,564	1,199,622	1,992,185	1,018,516	571,310
Other noninterest income, net	1,249,375	1,351,324	1,303,750	1,047,918	1,191,641	1,278,146	1,294,202	1,527,822
Noninterest expense	8,525,997	10,605,914	7,637,907	7,455,083	7,877,518	7,735,249	7,253,331	6,798,629	34,224,901	29,664,727	27,498,134
Income before income taxes	3,210,110	4,202,741	3,239,206	2,665,870	905,926	2,316,595	2,332,036	2,512,835
Provision for income taxes	704,476	802,431	723,024	449,854	(40,284)	418,819	448,653	407,990	2,679,785	1,235,178	1,683,158
Net income available to common shareholders	$ 2,505,634	$ 3,400,310	$ 2,516,182	$ 2,216,016	$ 946,210	$ 1,897,776	$ 1,883,383	$ 2,104,845	$ 10,638,142	$ 6,832,214	$ 9,415,090
Basic income per common share (in dollars per share)	$ 0.58	$ 0.78	$ 0.58	$ 0.51	$ 0.22	$ 0.44	$ 0.43	$ 0.49	$ 2.45	$ 1.58	$ 2.14
Diluted income per common share (in dollars per share)	$ 0.57	$ 0.78	$ 0.58	$ 0.51	$ 0.22	$ 0.43	$ 0.43	$ 0.49	$ 2.44	$ 1.57	$ 2.11