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Condensed Consolidated Balance Sheets - USD ($)
Mar. 31, 2020
Sep. 30, 2019
Current Assets:    
Cash and cash equivalents $ 18,738,000 $ 10,302,000
Marketable securities at fair value (cost $105,967,000 at March 31, 2020 and $104,176,000 at September 30, 2019) 102,275,000 105,322,000
Accounts receivable, less allowance for doubtful accounts of $474,000 at March 31, 2020 and $459,000 at September 30, 2019 2,366,000 1,603,000
Costs and estimated earnings in excess of billings 8,792,000 13,838,000
Inventories, net 27,063,000 25,366,000
Prepaid expenses and other current assets 2,144,000 499,000
Total current assets 161,378,000 156,930,000
Property and equipment, net 8,276,000 8,389,000
Other assets 53,000 53,000
Total Assets 169,707,000 165,372,000
Current liabilities:    
Accounts payable 4,380,000 1,907,000
Customer deposits 4,713,000 1,918,000
Accrued expenses 2,721,000 2,660,000
Total current liabilities 11,814,000 6,485,000
Deferred and other income taxes 509,000 3,372,000
Total liabilities 12,323,000 9,857,000
Commitments and contingencies
Shareholders' Equity:    
Preferred stock, par value $.10 per share; 300,000 shares authorized; none issued  
Capital in excess of par value 12,194,000 12,159,000
Retained earnings 143,731,000 141,897,000
Total shareholders' equity 157,384,000 155,515,000
Total Liabilities and Shareholders' Equity 169,707,000 165,372,000
Common Stock [Member]    
Shareholders' Equity:    
Common stock 1,228,000 1,228,000
Total shareholders' equity 1,228,000 1,228,000
Class B Stock [Member]    
Shareholders' Equity:    
Common stock 231,000 231,000
Total shareholders' equity $ 231,000 $ 231,000