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Quarterly Financial Information (Unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Sep. 30, 2011
Quarterly Financial Information                    
Net revenue $ 13,993,000 $ 22,986,000 $ 19,339,000 $ 6,864,000 $ 12,165,000 $ 23,015,000 $ 16,727,000 $ 7,785,000    
Production costs 12,501,000 17,237,000 15,273,000 6,141,000 10,661,000 18,756,000 14,052,000 6,809,000 51,152,000 50,278,000
Gross profit 1,492,000 5,749,000 4,066,000 723,000 1,504,000 4,259,000 2,675,000 976,000    
Product engineering and development 575,000 670,000 556,000 539,000 601,000 547,000 534,000 529,000 2,339,000 2,211,000
Selling, general and administrative 2,299,000 2,678,000 2,523,000 1,797,000 2,284,000 2,265,000 2,294,000 2,103,000 9,298,000 8,946,000
Income (loss) from operations (1,382,000) 2,401,000 987,000 (1,613,000) (1,381,000) 1,447,000 (153,000) (1,656,000) 393,000 (1,743,000)
Other income (expense) 1,158,000 (696,000) 3,184,000 2,813,000 (5,140,000) 52,000 1,131,000 3,166,000 6,459,000 (791,000)
Income (loss) before income tax expense (benefit) (224,000) 1,705,000 4,171,000 1,200,000 (6,521,000) 1,499,000 978,000 1,510,000 6,852,000 (2,534,000)
Income tax expense (benefit) 137,000 513,000 1,405,000 325,000 (2,100,000) 409,000 (1,472,000) 405,000 2,380,000 (2,758,000)
Net income $ (361,000) $ 1,192,000 $ 2,766,000 $ 875,000 $ (4,421,000) $ 1,090,000 $ 2,450,000 $ 1,105,000 $ 4,472,000 $ 224,000
Net income (loss) - basic earnings (loss) per share $ (0.04) $ 0.13 $ 0.29 $ 0.09 $ (0.46) $ 0.11 $ 0.26 $ 0.12 $ 0.47 $ 0.02
Net income (loss) - diluted earnings (loss) per share $ (0.04) $ 0.13 $ 0.29 $ 0.09 $ (0.46) $ 0.11 $ 0.26 $ 0.12 $ 0.47 $ 0.02