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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]        
Net revenue $ 30,829,000 $ 22,526,000 $ 53,951,000 $ 38,309,000
Costs and expenses:        
Production costs 22,059,000 15,869,000 40,098,000 27,502,000
Product engineering and development 758,000 470,000 1,458,000 886,000
Selling, general and administrative 2,921,000 2,127,000 5,613,000 4,317,000
Total costs and expenses 25,738,000 18,466,000 47,169,000 32,705,000
Operating income 5,091,000 4,060,000 6,782,000 5,604,000
Other income (expense), net:        
Interest and dividend income, net of fees 383,000 162,000 676,000 203,000
Net realized and unrealized gains (losses) on marketable securities (719,000) 656,000 (558,000) 1,063,000
Other 3,000   7,000  
Other income (expense), net (333,000) 818,000 125,000 1,266,000
Income before income tax expense 4,758,000 4,878,000 6,907,000 6,870,000
Income tax expense 994,000 1,463,000 797,000 2,061,000
Net income $ 3,764,000 $ 3,415,000 $ 6,110,000 $ 4,809,000
Basic Income per Common Share:        
Net income per share $ 0.26 $ 0.24 $ 0.42 $ 0.33
Diluted Income per Common Share:        
Net income per share $ 0.26 $ 0.23 $ 0.41 $ 0.33