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Revenue Impact on Financial Statements Income Statement (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
Sales, net $ 9,479,159 $ 4,811,774 $ 16,793,253 $ 11,379,494
Cost of goods sold 7,329,815 3,550,083 12,337,646 8,500,151
Provision for income taxes 81,000 (10,000) 259,000 102,000
Net income (loss) 375,517 $ 52,147 1,116,349 $ 353,894
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Sales, net 8,456,485   15,697,136  
Cost of goods sold 6,264,341   11,236,530  
Provision for income taxes 89,000   259,000  
Net income (loss) 410,317   1,121,348  
Accounting Standards Update 2014-09 [Member]        
Sales, net 1,022,674   1,096,117  
Cost of goods sold 1,065,474   1,101,116  
Provision for income taxes (8,000)    
Net income (loss) $ (34,800)   $ (4,999)