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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Operating revenues $ 261,683,000us-gaap_SalesRevenueServicesNet $ 305,299,000us-gaap_SalesRevenueServicesNet $ 319,274,000us-gaap_SalesRevenueServicesNet
Operating costs:      
Operating expenses 223,336,000us-gaap_OperatingCostsAndExpenses 234,660,000us-gaap_OperatingCostsAndExpenses 258,970,000us-gaap_OperatingCostsAndExpenses
General and administrative 16,083,000us-gaap_GeneralAndAdministrativeExpense 13,364,000us-gaap_GeneralAndAdministrativeExpense 11,205,000us-gaap_GeneralAndAdministrativeExpense
Depreciation 40,168,000us-gaap_Depreciation 37,095,000us-gaap_Depreciation 32,498,000us-gaap_Depreciation
Operating costs, Total 279,587,000us-gaap_OperatingExpenses 285,119,000us-gaap_OperatingExpenses 302,673,000us-gaap_OperatingExpenses
(Loss) income from operations (17,904,000)us-gaap_OperatingIncomeLoss 20,180,000us-gaap_OperatingIncomeLoss 16,601,000us-gaap_OperatingIncomeLoss
Other income (expense):      
Interest income 73,000us-gaap_InterestIncomeDepositsWithFinancialInstitutions 63,000us-gaap_InterestIncomeDepositsWithFinancialInstitutions 28,000us-gaap_InterestIncomeDepositsWithFinancialInstitutions
Interest expense (535,000)us-gaap_InterestExpense (660,000)us-gaap_InterestExpense (629,000)us-gaap_InterestExpense
Other income (expense) 466,000us-gaap_OtherNonoperatingIncomeExpense (13,000)us-gaap_OtherNonoperatingIncomeExpense 516,000us-gaap_OtherNonoperatingIncomeExpense
(Loss) income before income tax (17,900,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 19,570,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 16,516,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit (expense)      
Current (787,000)us-gaap_CurrentIncomeTaxExpenseBenefit (817,000)us-gaap_CurrentIncomeTaxExpenseBenefit (490,000)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred 6,067,000us-gaap_DeferredIncomeTaxExpenseBenefit (8,273,000)us-gaap_DeferredIncomeTaxExpenseBenefit (4,913,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax benefit (expense) 5,280,000us-gaap_IncomeTaxExpenseBenefit (9,090,000)us-gaap_IncomeTaxExpenseBenefit (5,403,000)us-gaap_IncomeTaxExpenseBenefit
Net (loss) income (12,620,000)us-gaap_NetIncomeLoss 10,480,000us-gaap_NetIncomeLoss 11,113,000us-gaap_NetIncomeLoss [1]
Other comprehensive loss      
Net unrealized loss on foreign exchange rate translation, net of tax (217,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax    
Comprehensive (loss) income $ (12,837,000)us-gaap_ComprehensiveIncomeNetOfTax $ 10,480,000us-gaap_ComprehensiveIncomeNetOfTax $ 11,113,000us-gaap_ComprehensiveIncomeNetOfTax
Basic (loss) income per share attributable to common stock $ (1.59)us-gaap_EarningsPerShareBasic $ 1.31us-gaap_EarningsPerShareBasic $ 1.40us-gaap_EarningsPerShareBasic [1]
Diluted (loss) income per share attributable to common stock $ (1.59)us-gaap_EarningsPerShareDiluted $ 1.31us-gaap_EarningsPerShareDiluted $ 1.39us-gaap_EarningsPerShareDiluted [1]
Cash dividend declared per share of common stock $ 0.24us-gaap_CommonStockDividendsPerShareDeclared    
Weighted average equivalent common shares outstanding 7,959,452us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,879,614us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,841,722us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1]
Weighted average equivalent common shares outstanding-assuming dilution 7,959,452us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,920,365us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,877,107us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1]
[1] The 2012 earnings per share calculations have been adjusted for the two-class method to reflect restricted shares that were not reflected as participating in the prior period. Basic earnings per share as previously reported for the year ended September 30, 2012 was $1.42. Diluted earnings per share as previously reported for the year ended September 30, 2012 was $1.40. Basic weighted average shares outstanding as previously reported for the year ended September 30, 2012 was 7,841,722. Diluted weighted average shares outstanding as previously reported for the year ended September 30, 2012 was 7,931,593. The impact on all prior period financial statements is deemed immaterial.