Note 7 - Interest Rate Swaps (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Sep. 17, 2024	Jun. 21, 2024	Aug. 29, 2019	Aug. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 195,352		$ 340,121
Interest Rate Swap [Member]
Interest Rate Derivative Assets, at Fair Value	273,373	$ 1,327,893
Deferred Income Tax Expense (Benefit)	78,021	378,981
Accumulated Other Comprehensive Income (Loss), Net of Tax	195,352	$ 948,912
First IRSA With CoBank [Member] | Interest Rate Swap [Member]
Debt Instrument, Face Amount	16,137,500						$ 16,137,500
Second IRSA With CoBank [Member] | Interest Rate Swap [Member]
Debt Instrument, Face Amount	42,000,000					$ 42,000,000
Third IRSA with CoBank [Member] | Interest Rate Swap [Member]
Debt Instrument, Face Amount	$ 21,813,892			$ 21,813,892
CoBank [Member]
Debt Instrument, Face Amount					$ 180,000,000
Minimum [Member]
Debt Instrument, Covenants, Percentage of Debt Under IRSAs	35.00%
Minimum [Member] | CoBank [Member]
Debt Instrument, Covenants, Percentage of Debt Under IRSAs	35.00%