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Consolidated Balance Sheets (USD $)
Sep. 30, 2013
Sep. 30, 2012
Current assets:    
Cash and cash equivalents $ 9,557,000 $ 3,361,000
Marketable securities at fair value (cost of $81,165,000 at September 30, 2013 and $80,568,000 at September 30, 2012) 83,113,000 81,375,000
Account receivable, less allowance for doubtful accounts of $309,000 at September 30, 2013 and $368,000 at September 30, 2012 1,200,000 1,206,000
Costs and estimated earnings in excess of billings 0 3,448,000
Inventories, net 14,126,000 11,918,000
Prepaid expenses 795,000 782,000
Total current assets 108,791,000 102,090,000
Property and equipment, net 8,079,000 8,127,000
Other assets 78,000 95,000
Total Assets 116,948,000 110,312,000
Current liabilities:    
Account payable 1,283,000 1,881,000
Customer deposits 1,943,000 480,000
Accrued expenses 2,810,000 3,517,000
Total current liabilities 6,036,000 5,878,000
Deferred and other income taxes 484,000 974,000
Total liabilities 6,520,000 6,852,000
Commitments and contingencies      
Shareholders' equity:    
Preferred stock, par value $.10 per share; 300,000 shares authorized; none issued      
Common stock 801,000 801,000
Capital in excess of par value 10,292,000 10,049,000
Retained earnings 99,184,000 92,459,000
Total shareholders' equity 110,428,000 103,460,000
Total Liabilities and Shareholders' Equity 116,948,000 110,312,000
Class B Stock [Member]
    
Shareholders' equity:    
Common stock 151,000 151,000
Total shareholders' equity $ 151,000 $ 151,000