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Condensed Consolidated Statements of Income - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]        
Net revenue $ 26,670,000 $ 30,829,000 $ 47,997,000 $ 53,951,000
Costs and expenses:        
Production costs 16,759,000 22,059,000 33,169,000 40,098,000
Product engineering and development 823,000 758,000 1,546,000 1,458,000
Selling, general and administrative 2,474,000 2,921,000 4,664,000 5,613,000
Total costs and expenses 20,056,000 25,738,000 39,379,000 47,169,000
Operating income 6,614,000 5,091,000 8,618,000 6,782,000
Other income (expense), net:        
Interest and dividend income, net of fees 507,000 383,000 1,041,000 676,000
Net realized and unrealized gains (losses) on marketable securities 2,204,000 (719,000) 57,000 (558,000)
Other   3,000   7,000
Other income (expense),net 2,711,000 (333,000) 1,098,000 125,000
Income before income tax expense 9,325,000 4,758,000 9,716,000 6,907,000
Income tax expense 1,865,000 994,000 1,943,000 797,000
Net income $ 7,460,000 $ 3,764,000 $ 7,773,000 $ 6,110,000
Basic Income per Common Share:        
Net income per share $ 0.51 $ 0.26 $ 0.53 $ 0.42
Diluted Income per Common Share:        
Net income per share $ 0.51 $ 0.26 $ 0.53 $ 0.41