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Leases (Details Narrative) - USD ($)
3 Months Ended 9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Operating lease payments $ 111,000 $ 91,000 $ 315,000 $ 259,000
3Dent Acquisition [Member]        
Lessee, operating lease, option to extend     expire in January of 2023  
Lessee, operating lease, term of contract 3 years   3 years  
Lease expiration date     Jun. 30, 2022  
Monroe Township [Member]        
Lessee, operating lease, option to extend     The initial lease term is for seven years which expires in November of 2024 with an option to extend the lease for another five years.  
Lessee, operating lease, term of contract 7 years   7 years