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Note 15 - Equity Incentive Plan and Stock Based Compensation (Details Textual) - USD ($)
3 Months Ended
Feb. 25, 2020
Feb. 29, 2020
Feb. 28, 2019
Nov. 30, 2019
Jan. 27, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   0 0    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   10,517 5,493    
Share-based Payment Arrangement, Expense, Net of Shares Repurchased   $ 18,516 $ 54,726    
Non-qualified Stock Units to Non-employee Directors Annually or Upon Election [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       1,000 1,000
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)   0 1,400    
Share-based Payment Arrangement, Expense   $ 37,580 $ 65,546    
Restricted Stock [Member] | Employees, Directors, and Consultants [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   48,750 67,053    
Restricted Stock [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   5,000 6,000    
The 2020 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 500,000