Note 1 - Summary of Significant Accounting Policies - Accumulated Other Comprehensive Earnings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 60,440,931	$ 74,703,914
Net current period other comprehensive earnings (loss)	2,220,181	(11,761,544)
Balance	67,003,549	60,440,931
AOCI Attributable to Parent [Member]
Balance	(8,841,517)	2,920,027
Other comprehensive earnings (loss) before reclassification	2,173,761	(11,770,084)
Amount reclassified from accumulated other comprehensive earnings	46,420	8,540
Net current period other comprehensive earnings (loss)	2,220,181	(11,761,544)
Balance	$ (6,621,336)	$ (8,841,517)