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Supplemental Disclosure for Statement of Cash Flows (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Jan. 31, 2021
Apr. 30, 2021
Apr. 30, 2020
Supplemental Cash Flow Elements [Abstract]      
Interest paid   $ 177 $ 204
Reductions in measurement right of use assets and liabilities   $ 67 $ 127
Common stock to executives (in Shares) 332,700    
Accrued bonuses $ 875    
Issued shares of common stock (in Shares)   208,537 333,265
Share based compensation   $ 780 $ 836