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CONSOLIDATED BALANCE SHEETS (USD $)
Dec. 31, 2014
Sep. 30, 2014
Current assets:    
Cash and cash equivalents $ 14,188,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 16,104,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts and other receivables, net of allowance for doubtful accounts of: $33,000 at December 31, 2014; $34,000 at September 30, 2014 2,467,000us-gaap_AccountsAndOtherReceivablesNetCurrent 2,910,000us-gaap_AccountsAndOtherReceivablesNetCurrent
Note receivable 891,000us-gaap_NotesAndLoansReceivableNetCurrent  
Prepaid expenses 362,000us-gaap_PrepaidExpenseCurrent 221,000us-gaap_PrepaidExpenseCurrent
Investment held for sale   1,139,000us-gaap_ShortTermInvestments
Real estate held for sale 5,448,000us-gaap_InventoryOperativeBuilders 5,448,000us-gaap_InventoryOperativeBuilders
Other current assets 701,000us-gaap_OtherAssetsCurrent 698,000us-gaap_OtherAssetsCurrent
Total current assets 24,057,000us-gaap_AssetsCurrent 26,520,000us-gaap_AssetsCurrent
Investments 5,988,000us-gaap_LongTermInvestments 5,900,000us-gaap_LongTermInvestments
Property and equipment 216,705,000us-gaap_PropertyPlantAndEquipmentGross 223,023,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depletion, depreciation, and amortization (195,098,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (200,673,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 21,607,000us-gaap_PropertyPlantAndEquipmentNet 22,350,000us-gaap_PropertyPlantAndEquipmentNet
Total assets 51,652,000us-gaap_Assets 54,770,000us-gaap_Assets
Current liabilities:    
Accounts payable 2,418,000us-gaap_AccountsPayableCurrent 3,453,000us-gaap_AccountsPayableCurrent
Accrued operating and other expenses 2,427,000us-gaap_OtherAccruedLiabilitiesCurrent 2,464,000us-gaap_OtherAccruedLiabilitiesCurrent
Accrued incentive and other compensation 916,000us-gaap_EmployeeRelatedLiabilitiesCurrent 1,085,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Current portion of long-term debt 5,697,000us-gaap_LongTermDebtCurrent 4,449,000us-gaap_LongTermDebtCurrent
Other current liabilities 2,891,000us-gaap_OtherLiabilitiesCurrent 3,072,000us-gaap_OtherLiabilitiesCurrent
Total current liabilities 14,349,000us-gaap_LiabilitiesCurrent 14,523,000us-gaap_LiabilitiesCurrent
Long-term debt 5,000,000us-gaap_LongTermDebtNoncurrent 6,650,000us-gaap_LongTermDebtNoncurrent
Liability for retirement benefits 4,074,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 4,266,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Asset retirement obligation 8,033,000us-gaap_AssetRetirementObligationsNoncurrent 8,185,000us-gaap_AssetRetirementObligationsNoncurrent
Deferred income taxes 1,074,000us-gaap_DeferredTaxLiabilitiesNoncurrent 1,201,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 32,530,000us-gaap_Liabilities 34,825,000us-gaap_Liabilities
Commitments and contingencies (Note 13)      
Equity:    
Common stock, par value $0.50 per share; authorized, 20,000,000 shares: 8,445,060 issued at December 31, 2014 and September 30, 2014 4,223,000us-gaap_CommonStockValue 4,223,000us-gaap_CommonStockValue
Additional paid-in capital 1,322,000us-gaap_AdditionalPaidInCapitalCommonStock 1,315,000us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 15,737,000us-gaap_RetainedEarningsAccumulatedDeficit 16,204,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss, net (639,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (258,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost: 167,900 shares at December 31, 2014 and September 30, 2014 (2,286,000)us-gaap_TreasuryStockValue (2,286,000)us-gaap_TreasuryStockValue
Total stockholders' equity 18,357,000us-gaap_StockholdersEquity 19,198,000us-gaap_StockholdersEquity
Non-controlling interests 765,000us-gaap_MinorityInterest 747,000us-gaap_MinorityInterest
Total equity 19,122,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 19,945,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity $ 51,652,000us-gaap_LiabilitiesAndStockholdersEquity $ 54,770,000us-gaap_LiabilitiesAndStockholdersEquity