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Note 8 - Stock-based Compensation (Details Textual) - shares
3 Months Ended 6 Months Ended
Jul. 05, 2020
Jul. 05, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 930,000 930,000
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years