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Condensed Consolidated Statements of Income - USD ($)
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]    
Net revenue $ 21,327,000 $ 23,122,000
Costs and expenses:    
Production costs 16,410,000 18,039,000
Product engineering and development 723,000 700,000
Selling, general and administrative 2,190,000 2,692,000
Total costs and expenses 19,323,000 21,431,000
Operating income 2,004,000 1,691,000
Other income (expense), net:    
Interest and dividend income, net of fees 534,000 293,000
Realized and unrealized gains (losses) on marketable securities, net (2,147,000) 161,000
Other   4,000
Other income (expense),net (1,613,000) 458,000
Income before income tax expense (benefit) 391,000 2,149,000
Income tax expense (benefit) 78,000 (197,000)
Net income $ 313,000 $ 2,346,000
Basic Income per Common Share:    
Net income per share $ 0.02 $ 0.16
Diluted Income per Common Share:    
Net income per share $ 0.02 $ 0.16