XML 47 R34.htm IDEA: XBRL DOCUMENT v3.19.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
May 01, 2018
Significant accounting policies and useful lives      
Accumulated deficit $ (7,999,000) $ (8,743,000) $ (8,641,000)
Allowance for doubtful accounts 12,000 12,000  
Amount of impairment losses $ 0    
Inventory time horizon for excess and obsolete review 12 months    
Individual parts time horizon to review for obsolete inventory 12 months    
Individual parts time horizon to review for excess inventory 12 months    
Inventory Reserves $ 332,000 364,000  
Advertising costs $ 0 $ 22,000  
Provided limited warranty period 1 year    
Effect of Change Higher/(Lower)      
Significant accounting policies and useful lives      
Accumulated deficit $ (546,000)    
ASU 2014-09 | Effect of Change Higher/(Lower)      
Significant accounting policies and useful lives      
Accumulated deficit     $ 102,000
Equipment | Minimum      
Significant accounting policies and useful lives      
Estimated useful lives 3 years    
Equipment | Maximum      
Significant accounting policies and useful lives      
Estimated useful lives 10 years    
Buildings and improvements | Minimum      
Significant accounting policies and useful lives      
Estimated useful lives 3 years 6 months    
Buildings and improvements | Maximum      
Significant accounting policies and useful lives      
Estimated useful lives 20 years