Note 11 - Other Information - Summary of Accrued Expenses (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Bonuses	$ 196,500	$ 348,000
Distribution fees	379,719	359,550
Payroll and related expenses	296,688	292,560
Reserve for outdated material	331,943	313,904
Company 401(k) contribution	54,500	109,000
Audit fee	38,000	61,500
Annual report expenses	50,373	64,038
Sales rebates	169,203	56,857
Other	28,932	21,981
Total accrued expenses	$ 1,545,858	$ 1,627,390