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Condensed Consolidated Balance Sheets (USD $)
Mar. 31, 2015
Sep. 30, 2014
Current Assets:    
Cash and cash equivalents $ 10,010,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 7,193,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities at fair value (cost $86,104,000 at March 31, 2015 and $84,997,000 at September 30, 2014) 87,400,000us-gaap_MarketableSecuritiesCurrent 87,112,000us-gaap_MarketableSecuritiesCurrent
Accounts receivable, less allowance for doubtful accounts of $264,000 at March 31, 2015 and $244,000 at September 30, 2014 2,096,000us-gaap_AccountsReceivableNetCurrent 1,448,000us-gaap_AccountsReceivableNetCurrent
Costs and estimated earnings in excess of billings 2,344,000us-gaap_ReceivablesLongTermContractsOrPrograms 344,000us-gaap_ReceivablesLongTermContractsOrPrograms
Inventories, net 13,351,000us-gaap_InventoryNet 13,673,000us-gaap_InventoryNet
Prepaid expenses and other current assets 896,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 849,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total Current Assets 116,097,000us-gaap_AssetsCurrent 110,619,000us-gaap_AssetsCurrent
Property and equipment, net 6,673,000us-gaap_PropertyPlantAndEquipmentNet 7,141,000us-gaap_PropertyPlantAndEquipmentNet
Other assets 63,000us-gaap_OtherAssetsNoncurrent 68,000us-gaap_OtherAssetsNoncurrent
Total Assets 122,833,000us-gaap_Assets 117,828,000us-gaap_Assets
Current Liabilities:    
Accounts payable 1,934,000us-gaap_AccountsPayableCurrent 947,000us-gaap_AccountsPayableCurrent
Customer deposits 4,659,000us-gaap_CustomerDepositsCurrent 324,000us-gaap_CustomerDepositsCurrent
Accrued expenses 1,459,000us-gaap_AccruedLiabilitiesCurrent 1,689,000us-gaap_AccruedLiabilitiesCurrent
Total Current Liabilities 8,052,000us-gaap_LiabilitiesCurrent 2,960,000us-gaap_LiabilitiesCurrent
Deferred and other income taxes 390,000us-gaap_DeferredTaxLiabilitiesNoncurrent 693,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Total Liabilities 8,442,000us-gaap_Liabilities 3,653,000us-gaap_Liabilities
Commitments and contingencies      
Shareholders' Equity:    
Preferred stock, par value $.10 per share; authorized 300,000 shares; none issued      
Capital in excess of par value 10,693,000us-gaap_AdditionalPaidInCapitalCommonStock 10,566,000us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 102,746,000us-gaap_RetainedEarningsAccumulatedDeficit 102,657,000us-gaap_RetainedEarningsAccumulatedDeficit
Total Shareholders' Equity 114,391,000us-gaap_StockholdersEquity 114,175,000us-gaap_StockholdersEquity
Total Liabilities and Shareholders' Equity 122,833,000us-gaap_LiabilitiesAndStockholdersEquity 117,828,000us-gaap_LiabilitiesAndStockholdersEquity
Common Stock [Member]    
Shareholders' Equity:    
Common stock 801,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= genc_CommonClassUndefinedMember		 801,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= genc_CommonClassUndefinedMember
Class B Stock [Member]    
Shareholders' Equity:    
Common stock $ 151,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 151,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember