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Balance Sheets (Unaudited) (USD $)
Feb. 28, 2015
May 31, 2014
Current assets:    
Cash and cash equivalents $ 2,372,115us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,793,642us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 3,890,872us-gaap_AccountsReceivableNetCurrent 2,894,344us-gaap_AccountsReceivableNetCurrent
Inventory 9,271,452us-gaap_InventoryPartsAndComponentsNetOfReserves 8,978,302us-gaap_InventoryPartsAndComponentsNetOfReserves
Costs and estimated earnings in excess of billings 4,100,878us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 2,373,791us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Other current assets 1,551,512us-gaap_OtherAssetsCurrent 1,521,832us-gaap_OtherAssetsCurrent
Total current assets 21,186,829us-gaap_AssetsCurrent 18,561,911us-gaap_AssetsCurrent
Maintenance and other inventory, net 645,322us-gaap_OtherInventoryNoncurrent 836,569us-gaap_OtherInventoryNoncurrent
Property and equipment, net 7,764,789us-gaap_PropertyPlantAndEquipmentNet 7,867,728us-gaap_PropertyPlantAndEquipmentNet
Other assets 168,693us-gaap_OtherAssetsMiscellaneousNoncurrent 164,568us-gaap_OtherAssetsMiscellaneousNoncurrent
Total assets 29,765,633us-gaap_Assets 27,430,776us-gaap_Assets
Current liabilities:    
Accounts payable 2,079,165us-gaap_AccountsPayableCurrent 1,166,162us-gaap_AccountsPayableCurrent
Accrued commissions 448,433us-gaap_AccruedSalesCommissionCurrent 429,839us-gaap_AccruedSalesCommissionCurrent
Billings in excess of costs and estimated earnings 1,614,195us-gaap_BillingsInExcessOfCostCurrent 850,531us-gaap_BillingsInExcessOfCostCurrent
Other current liabilities 596,160us-gaap_OtherLiabilitiesCurrent 1,343,788us-gaap_OtherLiabilitiesCurrent
Total current liabilities 4,737,953us-gaap_LiabilitiesCurrent 3,790,320us-gaap_LiabilitiesCurrent
Long-term liabilities 579,685us-gaap_LiabilitiesNoncurrent 558,485us-gaap_LiabilitiesNoncurrent
Stockholders' Equity:    
Common stock and additional paid-in capital 7,856,645us-gaap_AdditionalPaidInCapitalCommonStock 7,778,994us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 19,090,333us-gaap_RetainedEarningsAccumulatedDeficit 17,801,960us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock - at cost (2,498,983)us-gaap_TreasuryStockValue (2,498,983)us-gaap_TreasuryStockValue
Total stockholders'equity 24,447,995us-gaap_StockholdersEquity 23,081,971us-gaap_StockholdersEquity
Total liabilities and shareholders' equity $ 29,765,633us-gaap_LiabilitiesAndStockholdersEquity $ 27,430,776us-gaap_LiabilitiesAndStockholdersEquity