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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]    
Net revenue $ 13,258,000 $ 6,287,000
Costs and expenses:    
Production costs 9,976,000 5,942,000
Product engineering and development 382,000 329,000
Selling, general and administrative 1,785,000 1,650,000
Total costs and expenses 12,143,000 7,921,000
Operating income (loss) 1,115,000 (1,634,000)
Other income (expense), net:    
Interest and dividend income, net of fees 385,000 323,000
Realized and unrealized gains (losses) on marketable securities, net 593,000 (427,000)
Other 1,000 (1,000)
Other income (expense), net 979,000 (105,000)
Income (loss) before income tax expense (benefit) 2,094,000 (1,739,000)
Income tax expense (benefit) 519,000 (643,000)
Net Income (Loss) $ 1,575,000 $ (1,096,000)
Basic Income (Loss) per Common Share:    
Net income (loss) per share $ 0.16 $ (0.12)
Diluted Income (Loss) per Common Share:    
Net income (loss) per share $ 0.16 $ (0.12)