Note 1 - Summary of Significant Accounting Policies - Accumulated Other Comprehensive Earnings (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Balance	$ 68,685,411	$ 67,003,549	$ 60,440,931	$ 67,003,549	$ 60,440,931
Net current period other comprehensive (loss) earnings	(480,032)	(640,112)	1,596,353
Balance	67,613,677	68,685,411	63,598,529	67,613,677	63,354,040
AOCI Attributable to Parent [Member]
Balance	(7,261,448)	(6,621,336)	(8,841,517)	(6,621,336)	(8,841,517)
Other comprehensive (loss) earnings before reclassification				(1,137,192)	791,025
Amount reclassified from accumulated other comprehensive earnings				17,048	40,999
Net current period other comprehensive (loss) earnings	(480,032)	(640,112)	1,596,353	(1,120,144)	832,024
Balance	$ (7,741,480)	$ (7,261,448)	$ (7,245,164)	$ (7,741,480)	$ (8,009,493)