Note 2 - Securities Available for Sale - Schedule of Debt Securities Available for Sale (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Amortized cost	$ 163,334,854	$ 145,878,693
Gross unrealized gains	1,892,475	543,015
Gross unrealized losses	(4,480,090)	(6,114,261)
Fair value	160,747,239	140,307,447
US Government Agencies Debt Securities [Member]
Amortized cost, one through five years	3,000,000	3,000,000
Gross unrealized gains, one through five years	0	0
Gross unrealized losses, one through five years	(70,821)	(151,590)
Fair value, one through five years	2,929,179	2,848,410
Corporate Debt Securities [Member]
Amortized cost, one through five years	10,131,978	9,112,269
Gross unrealized gains, one through five years	80,442	83,414
Gross unrealized losses, one through five years	(210,021)	(64,547)
Fair value, one through five years	10,002,399	9,131,136
Amortized cost, five through ten years	30,585,848	25,410,219
Gross unrealized gains, five through ten years	520,032	202,205
Gross unrealized losses, five through ten years	(852,504)	(1,389,376)
Fair value, five through ten years	30,253,376	24,223,048
Amortized cost, greater than ten years	5,849,234	4,321,924
Gross unrealized gains, greater than ten years	225,891	202,576
Gross unrealized losses, greater than ten years	0	0
Fair value, greater than ten years	6,075,125	4,524,500
Amortized cost, less than one year		10,000,000
Gross unrealized gains, less than one year		0
Gross unrealized losses, less than one year		(55,870)
Fair value, less than one year		9,944,130
US Treasury Bill Securities [Member]
Amortized cost, less than one year		350,000
Gross unrealized gains, less than one year		1,090
Gross unrealized losses, less than one year		0
Fair value, less than one year		351,090
US States and Political Subdivisions Debt Securities [Member]
Amortized cost, five through ten years	505,933
Gross unrealized gains, five through ten years	0
Gross unrealized losses, five through ten years	(81,653)
Fair value, five through ten years	424,280
Amortized cost, greater than ten years		506,706
Gross unrealized gains, greater than ten years		0
Gross unrealized losses, greater than ten years		(108,431)
Fair value, greater than ten years		398,275
Residential Mortgage-Backed Securities [Member]
Amortized cost	99,876,238	76,661,752
Gross unrealized gains	1,066,110	53,730
Gross unrealized losses	(1,611,337)	(2,162,673)
Fair value	99,331,011	74,552,809
Commercial Mortgage-Backed Securities [Member]
Amortized cost	13,385,623	16,515,823
Gross unrealized gains	0	0
Gross unrealized losses	(1,653,754)	(2,181,774)
Fair value	$ 11,731,869	$ 14,334,049

Gross unrealized gains of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.