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Note 15 - Equity Incentive Plan and Stock Based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Feb. 25, 2020
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2020
Aug. 31, 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   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)   0 0 14,471 8,589    
Share-based Payment Arrangement, Expense, Net of Shares Repurchased       $ 169,126 $ 142,647    
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      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)       4,833 2,400    
Share-based Payment Arrangement, Expense   $ 42,910 $ 40,601 $ 195,662 $ 160,045    
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)       128,750 72,437    
Restricted Stock [Member] | Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       20,000 21,000    
The 2020 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 500,000