XML 42 R29.htm IDEA: XBRL DOCUMENT v3.20.2
Note 1 - Nature of Operations, Organization and Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Duration after Which Invoices Are Considered to Be Doubtful (Day) 90 days  
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 143 $ 143
Duration During Which Inventory If Inactive Taken as Obsolete (Year) 5 years  
Inventory Valuation Reserves, Ending Balance $ 685 718
Period for Payment Due (Day) 30 days  
Cash, Uninsured Amount $ 12,509 5,365
Research and Development Expense, Total 2,404 1,888
Kansas Expanded Lottery Act Management Contract Privilege Fee [Member]    
Finite-Lived Intangible Assets, Gross, Total 5,500 5,500
Gaming Equipment [Member]    
Finite-Lived Intangible Assets, Gross, Total $ 5,868 5,646
Finite-Lived Intangible Asset, Useful Life (Year) 3 years  
JET Autopilot Intellectual Property [Member]    
Finite-Lived Intangible Assets, Gross, Total $ 1,417 $ 1,417
Finite-Lived Intangible Asset, Useful Life (Year) 15 years  
Other Miscellaneous Long-Term Assets [Member]    
Finite-Lived Intangible Assets, Gross, Total $ 914  
Supplemental Type Certificates [Member]    
Finite-Lived Intangible Asset, Useful Life (Year) 7 years  
Minimum [Member]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Maximum [Member]    
Property, Plant and Equipment, Useful Life (Year) 39 years