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Impact of Adoption of Standards Related to Revenue Recognition (Details) - USD ($)	Nov. 30, 2018	Jun. 01, 2018	May 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventory	$ 12,081,725		$ 11,317,775
Costs and estimated earnings in excess of billings	5,953,406		6,356,963
Billings in excess of costs and estimated earnings	793,578		2,043,002
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]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
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
Billings in excess of costs and estimated earnings		2,017,897	2,043,002
Other accrued expenses	1,818,422	2,207,215	1,412,502
Retained earnings	$ 28,080,428	26,964,079	$ 26,959,080
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventory		1,101,116
Costs and estimated earnings in excess of billings		(326,509)
Billings in excess of costs and estimated earnings		(25,105)
Other accrued expenses		794,713
Retained earnings		$ 4,999

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance.

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