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Note 11 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2016
Contractual Obligation, Total $ 4,376,000   $ 4,376,000    
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 $ 61,000 $ 65,000 $ 147,000 $ 185,000