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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Net revenue $ 23,743,000 $ 19,863,000 $ 62,052,000 $ 55,199,000
Costs and expenses:        
Production costs 17,053,000 14,712,000 44,555,000 41,325,000
Product engineering and development 637,000 379,000 1,523,000 1,140,000
Selling, general and administrative 2,259,000 1,979,000 6,576,000 5,954,000
Total costs and expenses 19,949,000 17,070,000 52,654,000 48,419,000
Operating income 3,794,000 2,793,000 9,398,000 6,780,000
Other income (expense), net:        
Interest and dividend income, net of fees 181,000 99,000 384,000 688,000
Net realized and unrealized gains (losses) on marketable securities (253,000) 464,000 810,000 567,000
Other       2,000
Other income (expense), net (72,000) 563,000 1,194,000 1,257,000
Income before income tax expense 3,722,000 3,356,000 10,592,000 8,037,000
Income tax expense 1,134,000 1,242,000 3,195,000 2,718,000
Net income $ 2,588,000 $ 2,114,000 $ 7,397,000 $ 5,319,000
Basic Income per Common Share:        
Net income per share [1] $ 0.18 $ 0.15 $ 0.51 $ 0.37
Diluted Income per Common Share:        
Net income per share [1] $ 0.18 $ 0.15 $ 0.50 $ 0.37
[1] Prior year adjusted for three-for-two stock split