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Condensed Consolidated Balance Sheets - USD ($)
Jun. 30, 2018
Sep. 30, 2017
Current Assets:    
Cash and cash equivalents $ 24,911,000 $ 22,933,000
Marketable securities at fair value (cost $88,993,000 at June 30, 2018 and $86,967,000 at September 30, 2017) 87,900,000 87,886,000
Accounts receivable, less allowance for doubtful accounts of $267,000 at June 30, 2018 and $207,000 at September 30, 2017 1,599,000 1,184,000
Costs and estimated earnings in excess of billings 8,336,000 6,768,000
Inventories, net 16,244,000 16,687,000
Prepaid expenses and other current assets 955,000 1,660,000
Total Current Assets 139,945,000 137,118,000
Property and equipment, net 8,026,000 5,722,000
Other assets 53,000 53,000
Total Assets 148,024,000 142,893,000
Current Liabilities:    
Accounts payable 3,093,000 1,320,000
Customer deposits 3,745,000 8,628,000
Accrued expenses and other current liabilities 2,522,000 2,426,000
Total Current Liabilities 9,360,000 12,374,000
Deferred and other income taxes 519,000 1,601,000
Total Liabilities 9,879,000 13,975,000
Commitments and contingencies
Shareholders' Equity:    
Preferred stock, par value $.10 per share; 300,000 shares authorized; none issued
Capital in excess of par value 11,605,000 11,178,000
Retained earnings 125,091,000 116,299,000
Total Shareholders' Equity 138,145,000 128,918,000
Total Liabilities and Shareholders' Equity 148,024,000 142,893,000
Common Stock [Member]    
Shareholders' Equity:    
Common stock 1,220,000 1,215,000
Class B Stock [Member]    
Shareholders' Equity:    
Common stock $ 229,000 $ 226,000