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Note 8 - Stock-based Compensation (Details Textual)
9 Months Ended
Oct. 04, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 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