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Quarterly Financial Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | $ 7,568,000 | $ 18,690,000 | $ 17,737,000 | $ 4,948,000 | $ 13,993,000 | $ 22,986,000 | $ 19,339,000 | $ 6,864,000 | $ 48,943,000 | $ 63,182,000
Production costs | 6,278,000 | 13,720,000 | 13,411,000 | 4,531,000 | 12,501,000 | 17,237,000 | 15,273,000 | 6,141,000 | 37,940,000 | 51,152,000
Gross profit | 1,290,000 | 4,970,000 | 4,326,000 | 417,000 | 1,492,000 | 5,749,000 | 4,066,000 | 723,000 |  |
Production engineering and development | 391,000 | 420,000 | 454,000 | 448,000 | 575,000 | 670,000 | 556,000 | 539,000 | 1,713,000 | 2,339,000
Selling, general and administrative | 902,000 | 1,867,000 | 1,984,000 | 1,959,000 | 2,299,000 | 2,678,000 | 2,523,000 | 1,797,000 | 6,712,000 | 9,298,000
Operating income | (3,000) | 2,683,000 | 1,888,000 | (1,990,000) | (1,382,000) | 2,401,000 | 987,000 | (1,613,000) | 2,578,000 | 393,000
Other income (expense) | 1,075,000 | 679,000 | 1,822,000 | 179,000 | 1,158,000 | (696,000) | 3,184,000 | 2,813,000 | 3,755,000 | 6,459,000
Income (loss) before income tax expense | 1,072,000 | 3,362,000 | 3,710,000 | (1,811,000) | (224,000) | 1,705,000 | 4,171,000 | 1,200,000 | 6,333,000 | 6,852,000
Income tax expense (benefit) | (1,163,000) | 873,000 | 733,000 | (835,000) | 137,000 | 513,000 | 1,405,000 | 325,000 | (392,000) | 2,380,000
Net income | $ 2,235,000 | $ 2,489,000 | $ 2,977,000 | $ (976,000) | $ (361,000) | $ 1,192,000 | $ 2,766,000 | $ 875,000 | $ 6,725,000 | $ 4,472,000
Net income (loss) - basic earnings (loss) per share | $ 0.24 | $ 0.26 | $ 0.31 | $ (0.10) | $ (0.04) | $ 0.13 | $ 0.29 | $ 0.09 | $ 0.71 | $ 0.47
Net income (loss) - diluted earnings (loss) per share | $ 0.24 | $ 0.26 | $ 0.31 | $ (0.10) | $ (0.04) | $ 0.13 | $ 0.29 | $ 0.09 | $ 0.71 | $ 0.47

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