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Note 7 - Employee Stock Plans (Details Textual) - Stock Plan 2019 [Member]
shares in Millions
May 10, 2022
shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 0.9
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 1.4