Condensed Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Sep. 30, 2014
Current assets:
Cash and cash equivalents	$ 5,629,000	$ 7,193,000
Marketable securities at fair value (cost $85,553,000 at December 31, 2014 and $84,997,000 at September 30, 2014)	87,008,000	87,112,000
Accounts receivable, less allowance for doubtful accounts of $235,000 at December 31, 2014 and $244,000 at September 30, 2014	730,000	1,448,000
Costs and estimated earnings in excess of billings	2,358,000	344,000
Inventories, net	13,304,000	13,673,000
Prepaid expenses & other current assets	1,519,000	849,000
Total Current Assets	110,548,000	110,619,000
Property and equipment, net of accumulated depreciation	6,753,000	7,141,000
Other assets	66,000	68,000
Total Assets	117,367,000	117,828,000
Current Liabilities:
Accounts payable	777,000	947,000
Customer deposits	1,522,000	324,000
Accrued expenses	1,475,000	1,689,000
Total Current Liabilities	3,774,000	2,960,000
Deferred and other income taxes	449,000	693,000
Total Liabilities	4,223,000	3,653,000
Commitments and contingencies
Shareholders' equity:
Preferred stock, par value $.10 per share; authorized 300,000 shares; none issued
Capital in excess of par value	10,629,000	10,566,000
Retained earnings	101,563,000	102,657,000
Total Shareholders' Equity	113,144,000	114,175,000
Total Liabilities and Shareholders' Equity	117,367,000	117,828,000
Common Stock [Member]
Shareholders' equity:
Common stock	801,000	801,000
Class B Stock [Member]
Shareholders' equity:
Common stock	$ 151,000	$ 151,000