Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2015	Sep. 30, 2014
Current Assets:
Cash and cash equivalents	$ 9,568,000	$ 7,193,000
Marketable securities at fair value (cost $86,826,000 at June 30, 2015 and $84,997,000 at September 30, 2014)	87,475,000	87,112,000
Accounts receivable, less allowance for doubtful accounts of $337,000 at June 30, 2015 and $244,000 at September 30, 2014	1,249,000	1,448,000
Costs and estimated earnings in excess of billings	526,000	344,000
Inventories, net	13,152,000	13,673,000
Prepaid expenses and other current assets	393,000	849,000
Total Current Assets	112,363,000	110,619,000
Property and equipment, net	6,661,000	7,141,000
Other assets	61,000	68,000
Total Assets	119,085,000	117,828,000
Current Liabilities:
Accounts payable	1,286,000	947,000
Customer deposits	1,511,000	324,000
Accrued expenses and other current liabilities	1,389,000	1,689,000
Total Current Liabilities	4,186,000	2,960,000
Deferred and other income taxes	150,000	693,000
Total Liabilities	$ 4,336,000	$ 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	$ 10,785,000	$ 10,566,000
Retained earnings	103,012,000	102,657,000
Total Shareholders' Equity	114,749,000	114,175,000
Total Liabilities and Shareholders' Equity	119,085,000	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