Quarterly report pursuant to Section 13 or 15(d)

Long Term Debt (Details)

v3.22.1
Long Term Debt (Details)
SFr in Thousands, $ in Thousands
1 Months Ended 9 Months Ended
Nov. 30, 2018
USD ($)
Apr. 30, 2022
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2020
CHF (SFr)
Debt Disclosure [Abstract]        
Debt instrument, face amount $ 4,500      
Debt instrument maturity period 10 years      
Debt instrument, interest rate, stated percentage 5.09%      
Debt instrument, periodic payment $ 30      
Amortization of debt issuance costs $ 72      
Unamortized debt issuance expense   $ 48    
Mortgage agreement   4,000    
Cash collateral for borrowed securities   1,000    
Liquid assets   $ 25,000    
Liquidity covenant description   (a) the liquidity covenant was reduced to 150% (or approximately $6 million at April 30, 2022) of the loan principal from $25 million previously, and (b) the collateral requirement would be increased from $0.75 million to $1.0 million. The Company increased the collateral deposit to $1.0 million in November 2021 and was in compliance as to the liquidity covenant as of April 30, 2022.    
Foreign exchange rate amount     $ 400 SFr 400
Bear interest rate   0.00%    
Long term debt term   5 years