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Consolidated Balance Sheets - USD ($)
Sep. 30, 2016
Sep. 30, 2015
Current assets:    
Cash and cash equivalents $ 18,219,000 $ 11,152,000
Marketable securities at fair value (cost of $86,203,000 at September 30, 2016 and $87,123,000 at September 30, 2015) 85,938,000 84,357,000
Accounts receivable, less allowance for doubtful accounts of $195,000 at September 30, 2016 and $357,000 at September 30, 2015 1,110,000 874,000
Costs and estimated earnings in excess of billings 4,921,000 2,396,000
Inventories, net 11,634,000 12,770,000
Prepaid expenses 1,598,000 817,000
Total current assets 123,420,000 112,366,000
Property and equipment, net 5,239,000 6,388,000
Deferred and other income taxes   1,331,000
Other assets 53,000 59,000
Total Assets 128,712,000 120,144,000
Current liabilities:    
Accounts payable 1,443,000 1,529,000
Customer deposits 4,484,000 4,418,000
Accrued expenses 2,264,000 1,452,000
Total current liabilities 8,191,000 7,399,000
Deferred and other income taxes 316,000  
Total liabilities 8,507,000 7,399,000
Commitments and contingencies
Shareholders' equity:    
Preferred stock, par value $.10 per share; 300,000 shares authorized; none issued
Capital in excess of par value [1] 10,887,000 10,476,000
Retained earnings 107,881,000 100,838,000
Total shareholders' equity 120,205,000 112,745,000
Total Liabilities and Shareholders' Equity 128,712,000 120,144,000
Common Stock [Member]    
Shareholders' equity:    
Common stock [1] 1,211,000 1,205,000
Total shareholders' equity [1] 1,211,000 1,205,000
Class B Stock [Member]    
Shareholders' equity:    
Common stock [1] 226,000 226,000
Total shareholders' equity [1] $ 226,000 $ 226,000
[1] Adjusted for three-for-two stock split