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Note 6 - Stockholders' Equity (Details Textual) - USD ($)		3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 28, 2023	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)		2,809,060	2,027,153		2,809,060	2,027,153	2,440,673	2,066,343
Share-Based Payment Arrangement, Option [Member] \| Share-Based Payment Arrangement, Nonemployee [Member]
Share-Based Payment Arrangement, Expense		$ 3,800	$ 5,000		$ 17,000	$ 15,000
Share-Based Payment Arrangement, Option [Member] \| General and Administrative Expense [Member]
Share-Based Payment Arrangement, Expense		321,000	$ 233,000		$ 1,100,000	$ 1,100,000
Restricted Stock [Member]
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)					$ 0.89
Restricted Stock [Member] \| General and Administrative Expense [Member]
Share-Based Payment Arrangement, Expense		$ 137,500			$ 445,000
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)					11,500,000
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)		2,426,364	1,852,789		2,426,364	1,852,789
Non-Employees [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		382,696	174,364		382,696	174,364
Territory Manager [Member] \| Restricted Stock [Member]
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)		18,947			18,947
Share-Based Payment Arrangement, Expense		$ 36,500	$ 10,400		$ 17,700	$ 37,500
Deferred Compensation Arrangement with Individual, Requisite Service Period (Year)					2 years
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		5,200			$ 5,200
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					5 months 15 days
Board of Directors [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)	617,978
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)	$ 0.89
Director [Member] \| Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 269,000			$ 269,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					6 months
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%