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Note 6 - Stockholders' Equity (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)	2,518,798	2,174,491	2,440,673	2,066,343
Share-Based Payment Arrangement, Option [Member] \| Share-Based Payment Arrangement, Nonemployee [Member]
Share-Based Payment Arrangement, Expense	$ 7,798	$ 4,978
Share-Based Payment Arrangement, Option [Member] \| General and Administrative Expense [Member]
Share-Based Payment Arrangement, Expense	$ 362,751	$ 305,370
Restricted Stock [Member]
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)		28,100
Deferred Compensation Arrangement with Individual, Requisite Service Period (Year)		9 months 10 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 20,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 month 6 days
Restricted Stock [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Payment Arrangement, Expense	$ 140,000
The 2020 Equity Incentive Plan [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	4,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years
The 2020 Equity Incentive Plan [Member] \| Vice Chairman of the Board of Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)	5 years
Chief Executive Officer, and Other Employees [Member]
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)	2,136,101	2,000,127
Non-Employees [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	382,697	174,364
Territory Manager [Member] \| Restricted Stock [Member]
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)	49,615
Share-Based Payment Arrangement, Expense	$ 9,400	$ 22,000
Deferred Compensation Arrangement with Individual, Requisite Service Period (Year)	2 years
Director [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	899,390
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 0.82
Director [Member] \| Restricted Stock [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%
Director [Member] \| Restricted Stock [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%