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Consolidated Balance Sheets - USD ($)
Sep. 30, 2015
Sep. 30, 2014
Current assets:    
Cash and cash equivalents $ 11,152,000 $ 7,193,000
Marketable securities at fair value (cost of $87,123,000 at September 30, 2015 and $84,997,000 at September 30, 2014) 84,357,000 87,112,000
Accounts receivable, less allowance for doubtful accounts of $357,000 at September 30, 2015 and $244,000 at September 30, 2014 874,000 1,448,000
Costs and estimated earnings in excess of billings 2,396,000 344,000
Inventories, net 12,770,000 13,673,000
Prepaid expenses 817,000 849,000
Total current assets 112,366,000 110,619,000
Property and equipment, net 6,388,000 7,141,000
Deferred and other income taxes 1,331,000  
Other assets 59,000 68,000
Total Assets 120,144,000 117,828,000
Current liabilities:    
Accounts payable 1,529,000 947,000
Customer deposits 4,418,000 324,000
Accrued expenses 1,452,000 1,689,000
Total current liabilities 7,399,000 2,960,000
Deferred and other income taxes   693,000
Total liabilities $ 7,399,000 $ 3,653,000
Commitments and contingencies
Shareholders' equity:    
Preferred stock, par value $.10 per share; 300,000 shares authorized; none issued
Capital in excess of par value $ 10,953,000 $ 10,566,000
Retained earnings 100,838,000 102,657,000
Total shareholders' equity 112,745,000 114,175,000
Total Liabilities and Shareholders' Equity 120,144,000 117,828,000
Common Stock [Member]    
Shareholders' equity:    
Common stock 803,000 801,000
Total shareholders' equity 803,000 801,000
Class B Stock [Member]    
Shareholders' equity:    
Common stock 151,000 151,000
Total shareholders' equity $ 151,000 $ 151,000