Condensed Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Sep. 30, 2015
Current assets:
Cash and cash equivalents	$ 10,358,000	$ 11,152,000
Marketable securities at fair value (cost $87,158,000 at December 31, 2015 and $87,123,000 at September 30, 2015)	85,335,000	84,357,000
Accounts receivable, less allowance for doubtful accounts of $241,000 at December 31, 2015 and $357,000 at September 30, 2015	1,019,000	874,000
Costs and estimated earnings in excess of billings	4,044,000	2,396,000
Inventories, net	15,071,000	12,770,000
Prepaid expenses & other current assets	942,000	817,000
Total Current Assets	116,769,000	112,366,000
Property and equipment, net of accumulated depreciation	6,058,000	6,388,000
Deferred and other income taxes	1,032,000	1,331,000
Other assets	56,000	59,000
Total Assets	123,915,000	120,144,000
Current Liabilities:
Accounts payable	1,868,000	1,529,000
Customer deposits	6,135,000	4,418,000
Accrued expenses	1,587,000	1,452,000
Total Current Liabilities	$ 9,590,000	$ 7,399,000
Commitments and contingencies
Shareholders' equity:
Preferred stock, par value $.10 per share; authorized 300,000 shares; none issued
Capital in excess of par value	$ 10,958,000	$ 10,953,000
Retained earnings	102,413,000	100,838,000
Total Shareholders' Equity	114,325,000	112,745,000
Total Liabilities and Shareholders' Equity	123,915,000	120,144,000
Common Stock [Member]
Shareholders' equity:
Common stock	803,000	803,000
Class B Stock [Member]
Shareholders' equity:
Common stock	$ 151,000	$ 151,000