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CONSOLIDATED BALANCE SHEETS (USD $)
Sep. 30, 2014
Sep. 30, 2013
Current assets:    
Cash and cash equivalents $ 22,753,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 52,405,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 27,000,000us-gaap_CertificatesOfDepositAtCarryingValue 23,500,000us-gaap_CertificatesOfDepositAtCarryingValue
Accounts receivable, net of allowance for doubtful accounts of $250,000 at September 30, 2014 and September 30, 2013 39,995,000us-gaap_AccountsReceivableNetCurrent 37,488,000us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other assets 2,420,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 737,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Current deferred tax asset 5,977,000us-gaap_DeferredTaxAssetsNetCurrent 1,664,000us-gaap_DeferredTaxAssetsNetCurrent
Total current assets 98,145,000us-gaap_AssetsCurrent 115,794,000us-gaap_AssetsCurrent
Property, plant and equipment 337,922,000us-gaap_PropertyPlantAndEquipmentGross 325,464,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (173,428,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (152,231,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property, plant and equipment 164,494,000us-gaap_PropertyPlantAndEquipmentNet 173,233,000us-gaap_PropertyPlantAndEquipmentNet
Total assets 262,639,000us-gaap_Assets 289,027,000us-gaap_Assets
Current liabilities:    
Accounts payable 10,720,000us-gaap_AccountsPayableCurrent 15,880,000us-gaap_AccountsPayableCurrent
Accrued liabilities:    
Payroll costs and other taxes 1,998,000us-gaap_EmployeeRelatedLiabilitiesCurrent 1,850,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Other 4,097,000us-gaap_OtherAccruedLiabilitiesCurrent 6,154,000us-gaap_OtherAccruedLiabilitiesCurrent
Deferred revenue 801,000us-gaap_DeferredRevenueCurrent 3,438,000us-gaap_DeferredRevenueCurrent
Current maturities of notes payable and obligations under capital leases 6,752,000us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 9,258,000us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Total current liabilities 24,368,000us-gaap_LiabilitiesCurrent 36,580,000us-gaap_LiabilitiesCurrent
Long-term liabilities:    
Notes payable and obligations under capital leases less current maturities 4,933,000us-gaap_LongTermDebtAndCapitalLeaseObligations 3,697,000us-gaap_LongTermDebtAndCapitalLeaseObligations
Deferred tax liability 33,808,000us-gaap_DeferredTaxLiabilitiesNoncurrent 35,690,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Total long-term liabilities 38,741,000us-gaap_LiabilitiesNoncurrent 39,387,000us-gaap_LiabilitiesNoncurrent
Commitments and contingencies      
Stockholders' equity:    
Preferred stock-par value $1.00 per share; 5,000,000 shares authorized, none outstanding      
Common stock-par value $.33 1/3 per share; 50,000,000 shares authorized, 8,065,233 and 8,056,943 shares issued and outstanding at September 30, 2014 and September 30, 2013, respectively 2,688,000us-gaap_CommonStockValue 2,686,000us-gaap_CommonStockValue
Additional paid-in capital 96,086,000us-gaap_AdditionalPaidInCapitalCommonStock 94,846,000us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 100,973,000us-gaap_RetainedEarningsAccumulatedDeficit 115,528,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss, net of tax (217,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Total stockholders' equity 199,530,000us-gaap_StockholdersEquity 213,060,000us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 262,639,000us-gaap_LiabilitiesAndStockholdersEquity $ 289,027,000us-gaap_LiabilitiesAndStockholdersEquity