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Note 9 - Stock-Based Compensation (Details Textual) - USD ($)
6 Months Ended
Jun. 03, 2025
Jun. 18, 2024
Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     25,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     $ 2,900,000
The 2015 Omnibus Equity Incentive Plan [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 3,000,000 3,000,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)     3,200,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)     7,200,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     25,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Full Value Awards (in shares)     1,200,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Partial Value Awards (in shares)     1,000,000
The 2015 Omnibus Equity Incentive Plan [Member] | Minimum [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     1 year
The 2015 Omnibus Equity Incentive Plan [Member] | Maximum [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     4 years
The 2015 Omnibus Equity Incentive Plan [Member] | Restricted Stock [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     2,000,000
The 2015 Omnibus Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     10 years
Employee Stock Purchase Plan [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent     85.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Employee Contribution Limit, Percent     10.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Value, Shares Purchasable by Employees     $ 25,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee (in shares)     250
Share-Based Compensation Arrangement by Share-Based Payment Award, Increase in Maximum Number of Shares Purchasable (in shares) 250,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Purcahsable (in shares)     281,250