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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]    
Net revenue $ 69,991,000 $ 39,230,000
Costs and expenses:    
Production costs 52,466,000 31,724,000
Product engineering and development 1,567,000 1,422,000
Selling, general and administrative 8,142,000 6,878,000
Total costs and expenses 62,175,000 40,024,000
Operating income (loss) 7,816,000 (794,000)
Other income (expense), net:    
Interest and dividend income, net of fees 754,000 883,000
Realized and unrealized gains (losses) on marketable securities, net 828,000 (3,638,000)
Other 2,000 3,000
Other income (expense), net 1,584,000 (2,752,000)
Income (loss) before income tax expense (benefit) 9,400,000 (3,546,000)
Income tax expense (benefit) 2,357,000 (1,727,000)
Net income (loss) $ 7,043,000 $ (1,819,000)
Basic earnings per common share:    
Net income (loss) [1] $ 0.49 $ (0.13)
Diluted earnings per common share:    
Net income (loss) [1] $ 0.48 $ (0.13)
[1] Adjusted for three-for-two stock split