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Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Operating activities:    
Net income $ 1,148,114 $ 1,934,307
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation 453,823 395,821
Stock options issued for services 78,789 60,719
Changes in other assets and liabilities:    
Accounts receivable 208,765 (1,883,211)
Inventory (884,013) (936,101)
Costs and estimated earnings in excess of billings (923,853) 201,945
Other current assets 164,341 98,549
Accounts payable 274,686 (726,125)
Accrued commissions 214,972 (157,248)
Billings in excess of costs and estimated earnings (625,204) 898,014
Other current liabilities (1,077,518) 307,625
Net operating activities (967,098) 194,295
Investing activities:    
Acquisition of property and equipment (1,237,072) (855,129)
Other investing activities (17,024) (2,847)
Net investing activities (1,254,096) (857,976)
Financing activities:    
Proceeds from issuance of common stock, net 150,940 266,021
Net change in cash and cash equivalents (2,070,254) (397,660)
Cash and cash equivalents - beginning 6,086,080 4,895,898
Cash and cash equivalents - ending $ 4,015,826 $ 4,498,238