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Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Operating activities:    
Net income $ 1,288,373us-gaap_NetIncomeLoss $ 729,922us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation 556,884us-gaap_DepreciationDepletionAndAmortization 528,576us-gaap_DepreciationDepletionAndAmortization
Deferred income taxes 3,000us-gaap_DeferredIncomeTaxExpenseBenefit   
Stock options issued for services 37,112us-gaap_StockOptionPlanExpense 43,301us-gaap_StockOptionPlanExpense
Changes in other assets and liabilities:    
Accounts receivable (996,528)us-gaap_IncreaseDecreaseInAccountsReceivable (652,724)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory (101,903)us-gaap_IncreaseDecreaseInInventories 152,409us-gaap_IncreaseDecreaseInInventories
Costs and estimated earnings in excess of billings (1,727,087)us-gaap_IncreaseDecreaseInUnbilledReceivables (481,419)us-gaap_IncreaseDecreaseInUnbilledReceivables
Other current assets (11,480)us-gaap_IncreaseDecreaseInOtherCurrentAssets 64,766us-gaap_IncreaseDecreaseInOtherCurrentAssets
Accounts payable 913,003us-gaap_IncreaseDecreaseInAccountsPayableTrade (152,338)us-gaap_IncreaseDecreaseInAccountsPayableTrade
Accrued commissions 18,594us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (57,445)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Billings in excess of costs and estimated earnings 763,664us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings 563,704us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Other current liabilities (747,628)us-gaap_IncreaseDecreaseInOtherCurrentLiabilities (555,910)us-gaap_IncreaseDecreaseInOtherCurrentLiabilities
Net operating activities (3,996)us-gaap_NetCashProvidedByUsedInOperatingActivities 182,842us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:    
Acquisition of property and equipment (453,945)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,299,784)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Other investing activities (4,125)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (4,197)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net investing activities (458,070)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,303,981)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:    
Proceeds from issuance of common stock, net 40,539us-gaap_ProceedsFromIssuanceOfCommonStock 168,560us-gaap_ProceedsFromIssuanceOfCommonStock
Net financing activities 40,539us-gaap_NetCashProvidedByUsedInFinancingActivities 168,560us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents (421,527)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (952,579)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents - beginning 2,793,642us-gaap_CashAndCashEquivalentsAtCarryingValue 1,997,874us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents - ending $ 2,372,115us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,045,295us-gaap_CashAndCashEquivalentsAtCarryingValue