Note 17 - Quarterly Data (Unaudited) - Summary of Quarterly Data (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Sales	$ 32,660,531	$ 32,189,623	$ 31,902,027	$ 31,002,746	$ 27,320,481	$ 26,397,857	$ 26,449,885	$ 23,994,004	$ 127,754,927	$ 104,162,227
Gross Profit	7,588,082	6,309,803	6,768,491	6,366,405	4,731,545	5,397,709	5,780,290	6,002,921	27,032,781	21,912,465
Operating Income	2,760,946	1,999,678	2,375,527	1,397,321	676,214	1,868,781	2,119,797	2,325,460	8,533,472	6,990,252
Net Income	$ 3,069,719	$ 1,254,545	$ 1,171,264	$ 1,065,875	$ 64,699	$ 1,197,877	$ 1,247,305	$ 3,143,417	$ 6,561,403	$ 5,653,298
Net Income Per Common Share - Basic (in dollars per share)	$ 0.88	$ 0.36	$ 0.34	$ 0.31	$ 0.01	$ 0.35	$ 0.37	$ 0.93	$ 1.89	$ 1.66
Net Income Per Common Share - Diluted (in dollars per share)	$ 0.88	$ 0.36	$ 0.34	$ 0.31	$ 0.01	$ 0.35	$ 0.37	$ 0.93	$ 1.89	$ 1.66