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Note 11 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2016
Contractual Obligation, Total $ 3,200,000   $ 3,200,000    
Related Party Technology License Agreement [Member] | Syzygy Licensing LLC [Member]          
Royalty Payments, Percentage of Product Revenue         4.00%
Maximum Royalties to Be Paid Under Agreement         $ 1,000
Royalty Expense $ 34,000 $ 68,000 $ 83,000 $ 119,000