Note 17 - Quarterly Data (Unaudited) - Summary of Quarterly Data (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Revenue	$ 37,386,329	$ 36,736,228	$ 37,636,088	$ 38,439,639	$ 33,827,050	$ 33,641,513	$ 36,933,015	$ 39,484,356	$ 150,198,284	$ 143,885,934
Gross Profit	10,302,098	10,687,649	10,411,315	10,245,033	7,745,321	8,909,332	10,474,878	10,516,552	41,646,095	37,646,082
Operating Income	4,742,665	5,258,441	5,116,181	4,574,090	3,363,871	4,296,968	5,152,364	5,119,267	19,691,377	17,932,471
Net Income	$ 3,948,415	$ 3,369,211	$ 3,283,456	$ 2,996,885	$ 3,237,242	$ 2,814,736	$ 3,851,342	$ 3,391,473	$ 13,597,967	$ 13,294,793
Net Income Per Common Share - Basic (in dollars per share)	$ 1.12	$ 0.95	$ 0.93	$ 0.85	$ 0.92	$ 0.8	$ 1.1	$ 0.97	$ 3.84	$ 3.79
Net Income Per Common Share - Diluted (in dollars per share)	$ 1.11	$ 0.95	$ 0.92	$ 0.85	$ 0.91	$ 0.8	$ 1.09	$ 0.97	$ 3.83	$ 3.77