Note 7 - Investments, Held to Maturity ("HTM") - Summary of Held to Maturity Securities (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Amortized cost, HTM	$ 176,622,658	$ 167,437,616
Gross unrealized gains, HTM	674,559	279,918
Gross unrealized losses, HTM	6,707,943	6,253,961
HTM, fair value	170,589,274	161,463,573
US Treasury and Government [Member]
Amortized cost, HTM	34,691,658	34,511,849
Gross unrealized gains, HTM	0	0
Gross unrealized losses, HTM	709,002	682,198
HTM, fair value	33,982,656	33,829,651
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Amortized cost, HTM	1,000,000	1,000,000
Gross unrealized gains, HTM	0	0
Gross unrealized losses, HTM	11,448	1,360
HTM, fair value	988,552	998,640
Collateralized Loan Obligations [Member]
Amortized cost, HTM	17,975,057	16,387,997
Gross unrealized gains, HTM	69,938	88,489
Gross unrealized losses, HTM	81,883	59,090
HTM, fair value	17,963,112	16,417,396
Small Business Administration Bonds [Member]
Amortized cost, HTM	13,148,556	3,521,293
Gross unrealized gains, HTM	604,114	162,235
Gross unrealized losses, HTM	0	0
HTM, fair value	13,752,670	3,683,528
Taxable Municipal Bonds [Member]
Amortized cost, HTM	957,062	951,864
Gross unrealized gains, HTM	0	0
Gross unrealized losses, HTM	55,302	60,134
HTM, fair value	901,760	891,730
Collateralized Mortgage-Backed Securities [Member]
Amortized cost, HTM	108,850,325	111,064,613
Gross unrealized gains, HTM	507	29,194
Gross unrealized losses, HTM	5,850,308	5,451,179
HTM, fair value	$ 103,000,524	$ 105,642,628