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Note 8 - Stock-based Compensation (Details Textual)
Apr. 01, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 665,000
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years