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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]    
Net revenue $ 15,783,000 $ 13,258,000
Costs and expenses:    
Production costs 11,633,000 9,976,000
Product engineering and development 416,000 382,000
Selling, general and administrative 2,190,000 1,785,000
Total costs and expenses 14,239,000 12,143,000
Operating income 1,544,000 1,115,000
Other income (expense), net:    
Interest and dividend income, net of fees 41,000 385,000
Realized and unrealized gains (losses) on marketable securities, net 407,000 593,000
Other   1,000
Other income (expense), net 448,000 979,000
Income before income tax expense 1,992,000 2,094,000
Income tax expense 598,000 519,000
Net income $ 1,394,000 $ 1,575,000
Basic Income per Common Share:    
Net income per share [1] $ 0.10 $ 0.11
Diluted Income per Common Share:    
Net income per share [1] $ 0.10 $ 0.11
[1] Prior year adjusted for three-for-two stock split