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Unaudited Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Sales:        
Product $ 19,537 $ 12,125 $ 34,842 $ 27,279
Services 6,286 6,904 11,851 12,843
Total sales 25,823 19,029 46,693 40,122
Cost of sales:        
Product 15,676 10,610 28,900 23,375
Services 4,380 3,704 7,849 7,209
Total cost of sales 20,056 14,314 36,749 30,584
Gross profit 5,767 4,715 9,944 9,538
Operating expenses:        
Engineering and development 380 474 824 857
Selling, general and administrative 4,165 3,572 7,725 7,248
Total operating expenses 4,545 4,046 8,549 8,105
Operating income 1,222 669 1,395 1,433
Other income (expense):        
Foreign exchange gain (loss) (8) (10) 5 (26)
Other income (expense), net (17) (26) 29 (44)
Total other income (expense), net (25) (36) 34 (70)
Income before income taxes 1,197 633 1,429 1,363
Income tax expense 457 191 574 460
Net income 740 442 855 903
Net income attributable to common stockholders $ 724 $ 434 $ 838 $ 888
Net income per share – basic (in Dollars per share) $ 0.21 $ 0.13 $ 0.25 $ 0.26
Weighted average shares outstanding – basic (in Shares) 3,375 3,363 3,369 3,360
Net income per share – diluted (in Dollars per share) $ 0.21 $ 0.13 $ 0.25 $ 0.26
Weighted average shares outstanding – diluted (in Shares) 3,424 3,401 3,416 3,398