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Quarterly Results of Operations (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Quarterly Financial Information [Line Items]                              
Revenues $ 29,423us-gaap_Revenues $ 33,538us-gaap_Revenues $ 33,343us-gaap_Revenues $ 32,870us-gaap_Revenues $ 27,141us-gaap_Revenues $ 28,031us-gaap_Revenues $ 28,308us-gaap_Revenues $ 28,728us-gaap_Revenues $ 22,019us-gaap_Revenues $ 23,866us-gaap_Revenues $ 23,921us-gaap_Revenues $ 25,414us-gaap_Revenues $ 129,174us-gaap_Revenues $ 112,208us-gaap_Revenues $ 95,220us-gaap_Revenues
Gross Profit 25,676us-gaap_GrossProfit 29,195us-gaap_GrossProfit 29,048us-gaap_GrossProfit 28,829us-gaap_GrossProfit 23,755us-gaap_GrossProfit 24,440us-gaap_GrossProfit 24,628us-gaap_GrossProfit 25,233us-gaap_GrossProfit 19,087us-gaap_GrossProfit 20,824us-gaap_GrossProfit 20,642us-gaap_GrossProfit 22,024us-gaap_GrossProfit      
Net income $ 2,404us-gaap_NetIncomeLoss $ 4,423us-gaap_NetIncomeLoss $ 691us-gaap_NetIncomeLoss $ 3,722us-gaap_NetIncomeLoss $ 2,647us-gaap_NetIncomeLoss $ 1,604us-gaap_NetIncomeLoss $ 2,195us-gaap_NetIncomeLoss $ 2,745us-gaap_NetIncomeLoss $ 2,185us-gaap_NetIncomeLoss $ 1,453us-gaap_NetIncomeLoss $ 1,823us-gaap_NetIncomeLoss $ 2,117us-gaap_NetIncomeLoss $ 11,240us-gaap_NetIncomeLoss $ 9,191us-gaap_NetIncomeLoss $ 7,578us-gaap_NetIncomeLoss
Basic income (loss) per share:                              
Net income (loss) (in dollars per share) $ 0.25us-gaap_EarningsPerShareBasic $ 0.44us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ 0.39us-gaap_EarningsPerShareBasic $ 0.28us-gaap_EarningsPerShareBasic $ 0.17us-gaap_EarningsPerShareBasic $ 0.23us-gaap_EarningsPerShareBasic $ 0.29us-gaap_EarningsPerShareBasic $ 0.23us-gaap_EarningsPerShareBasic $ 0.15us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ 1.15us-gaap_EarningsPerShareBasic $ 0.97us-gaap_EarningsPerShareBasic $ 0.78us-gaap_EarningsPerShareBasic
Diluted income (loss) per share:                              
Net income (loss) (in dollars per share) $ 0.25us-gaap_EarningsPerShareDiluted $ 0.42us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ 0.37us-gaap_EarningsPerShareDiluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.17us-gaap_EarningsPerShareDiluted $ 0.23us-gaap_EarningsPerShareDiluted $ 0.29us-gaap_EarningsPerShareDiluted $ 0.23us-gaap_EarningsPerShareDiluted $ 0.15us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ 0.22us-gaap_EarningsPerShareDiluted $ 1.13us-gaap_EarningsPerShareDiluted $ 0.96us-gaap_EarningsPerShareDiluted $ 0.78us-gaap_EarningsPerShareDiluted
Weighted Average Number of Shares Outstanding, Basic, Total 9,546us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 10,179us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,883us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,661us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,575us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,504us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,479us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,514us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,685us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,633us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,725us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,720us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,816us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,518us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 9,691us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted Average Number of Shares Outstanding, Diluted 9,855us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 11,014us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,968us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,853us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,833us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,603us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,647us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,988us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,687us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,636us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,731us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,731us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,637us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,615us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,697us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding