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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Operating Lease, Payments $ 5,000 $ 48,000 $ 16,000 $ 100,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent     90.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay     4.00%  
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 26,000 $ 11,000 $ 79,000 $ 60,000