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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]    
Net revenue $ 23,122,000 $ 15,783,000
Costs and expenses:    
Production costs 18,039,000 11,633,000
Product engineering and development 700,000 416,000
Selling, general and administrative 2,692,000 2,190,000
Total costs and expenses 21,431,000 14,239,000
Operating income 1,691,000 1,544,000
Other income (expense), net:    
Interest and dividend income, net of fees 293,000 41,000
Realized and unrealized gains on marketable securities, net 161,000 407,000
Other 4,000  
Other income (expense), net 458,000 448,000
Income before income tax expense (benefit) 2,149,000 1,992,000
Income tax expense (benefit) (197,000) 598,000
Net income $ 2,346,000 $ 1,394,000
Basic Income per Common Share:    
Net income per share $ 0.16 $ 0.10
Diluted Income per Common Share:    
Net income per share $ 0.16 $ 0.10