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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]      
Net revenue $ 80,608,000 $ 69,991,000 $ 39,230,000
Cost of goods sold 59,449,000 52,466,000 31,724,000
Gross profit 21,159,000 17,525,000 7,506,000
Operating expenses:      
Product engineering and development 2,147,000 1,567,000 1,422,000
Selling, general and administrative 8,776,000 8,142,000 6,878,000
Total operating expenses 10,923,000 9,709,000 8,300,000
Operating income (loss) 10,236,000 7,816,000 (794,000)
Other income (expense), net:      
Interest and dividend income, net of fees 650,000 754,000 883,000
Realized and unrealized gains (losses) on marketable securities, net 1,297,000 828,000 (3,638,000)
Other (5,000) 2,000 3,000
Other income (expense), net 1,942,000 1,584,000 (2,752,000)
Income (loss) before income tax expense (benefit) 12,178,000 9,400,000 (3,546,000)
Income tax expense (benefit) 3,760,000 2,357,000 (1,727,000)
Net income (loss) $ 8,418,000 $ 7,043,000 $ (1,819,000)
Basic earnings per common share:      
Net income (loss) [1] $ 0.58 $ 0.49 $ (0.13)
Diluted earnings per common share:      
Net income (loss) [1] $ 0.57 $ 0.48 $ (0.13)
[1] 2016 and 2015 adjusted for three-for-two stock split