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Note 8 - Stockholders' Equity (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	Apr. 23, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)		2,027,153	2,408,151	2,027,153	2,408,151	2,066,343	2,428,329
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 2,900,000	$ 3,500,000	$ 2,900,000	$ 3,500,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				3 years
Share-Based Payment Arrangement, Option [Member] \| Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				216,296
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				2.45%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate				89.76%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate				0.00%
Share Price (in dollars per share)		$ 1.52		$ 1.52
Share-Based Payment Arrangement, Expense		$ 5,000	$ 5,000	$ 10,000	15,000
Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		86,458		$ 86,458
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 4 months 28 days
Share-Based Payment Arrangement, Expense		$ 54,000		$ 27,000	$ 21,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)		754,838		754,838		96,557
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				975,148
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)				$ 0.86
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
Chief Executive Officer, Chief Financial Officer and Employees [Member]
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)		1,852,789	2,264,127	1,852,789	2,264,127
Non-Employees [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		174,364	144,024	174,364	144,024
Vice Chairman of the Board of Directors [Member] \| The 2020 Equity Incentive Plan [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	2,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	5 years
Share-Based Payment Arrangement, Amount Capitalized		$ 223,000	$ 168,000	$ 501,000	$ 286,000
Territory Manager [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)		80,292		80,292
Board of Directors [Member] \| Restricted Stock [Member]
Share-Based Payment Arrangement, Expense		$ 213,000		$ 213,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				899,300
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
Board of Directors [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%
Board of Directors [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%