Condensed Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Sep. 30, 2013
Current assets:
Cash and cash equivalents	$ 5,002,000	$ 9,557,000
Marketable securities at fair value (cost $82,149,000 at December 31, 2013 and $81,165,000 at September 30, 2013)	84,591,000	83,113,000
Accounts receivable, less allowance for doubtful accounts of $188,000 at December 31, 2013 and $309,000 at September 30, 2013	967,000	1,200,000
Costs and estimated earnings in excess of billings	2,326,000	0
Inventories, net	14,031,000	14,126,000
Prepaid expenses	818,000	795,000
Total Current Assets	107,735,000	108,791,000
Property and equipment, net of accumulated depreciation	7,999,000	8,079,000
Other assets	75,000	78,000
Total Assets	115,809,000	116,948,000
Current Liabilities:
Accounts payable	1,046,000	1,283,000
Customer deposits	1,127,000	1,943,000
Accrued expenses	1,998,000	2,810,000
Total Current Liabilities	4,171,000	6,036,000
Deferred and other income taxes	704,000	484,000
Total Liabilities	4,875,000	6,520,000
Commitments and contingencies
Shareholders' equity:
Preferred stock, par value $.10 per share; authorized 300,000 shares; none issued
Common stock	801,000	801,000
Capital in excess of par value	10,352,000	10,292,000
Retained earnings	99,630,000	99,184,000
Total Shareholders' Equity	110,934,000	110,428,000
Total Liabilities and Shareholders' Equity	115,809,000	116,948,000
Class B Stock [Member]
Shareholders' equity:
Common stock	$ 151,000	$ 151,000