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Revenue Impact on Financial Statements Balance Sheet (Details) - USD ($)
Nov. 30, 2018
Jun. 01, 2018
May 31, 2018
Inventory $ 12,081,725   $ 11,317,775
Costs and estimated earnings in excess of billings 5,953,406   6,356,963
Other current assets 481,880   447,162
Other accrued expenses 1,818,422   1,412,502
Retained earnings 28,080,428   26,959,080
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Inventory 12,081,725 $ 12,418,891 11,317,775
Costs and estimated earnings in excess of billings 5,953,406 6,030,454 6,356,963
Other current assets 481,880    
Other accrued expenses 1,818,422 2,207,215 1,412,502
Retained earnings 28,080,428 $ 26,964,079 $ 26,959,080
Accounting Standards Update 2014-09 [Member]      
Inventory    
Costs and estimated earnings in excess of billings    
Other current assets    
Other accrued expenses    
Retained earnings