XML 53 R42.htm IDEA: XBRL DOCUMENT v3.21.2
Note 10 - Stock-based Compensation (Details Textual) - USD ($)
9 Months Ended
Jan. 15, 2021
May 31, 2021
May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   419,874 300,770
Share-based Payment Arrangement, Expense   $ 503,339 $ 998,122
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   827,502  
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year   160,835  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two   333,333  
Allocated Share Based Compensation Expense, Estimate, Fiscal Year Three   $ 333,334  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)   $ 3.12 $ 4.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)   6 years 4 months 24 days 6 years 3 months 7 days
The 2019 Plan [member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 800,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   1,600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   720,644  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   879,356  
The 2019 Plan [member] | One Year after Date of Grant [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   1 year  
The 2019 Plan [member] | One Year after Date of Grant [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years  
The 2007 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   783,652