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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