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Note 11 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Stock Plan 2019 [Member] - shares
May 10, 2022
May 09, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 900,000  
Common Stock, Capital Shares Reserved for Future Issuance (in shares) 1,422,027 522,027