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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

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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