Condensed Consolidated Balance Sheets - USD ($)	Dec. 31, 2023	Sep. 30, 2023
Current assets:
Cash and cash equivalents	$ 18,559,000	$ 17,031,000
Marketable securities at fair value (cost of $86,134,000 at December 31, 2023 and $85,514,000 at September 30, 2023)	86,231,000	84,252,000
Accounts receivable, less allowance for doubtful accounts of $485,000 at December 31, 2023 and $545,000 at September 30, 2023	4,028,000	2,467,000
Costs and estimated earnings in excess of billings	6,164,000	1,508,000
Inventories, net	72,209,000	71,527,000
Prepaid expenses and other current assets	2,377,000	2,169,000
Total current assets	189,568,000	178,954,000
Property and equipment, net	12,947,000	13,246,000
Deferred and other income taxes	2,855,000	3,167,000
Other long-term assets	288,000	381,000
Total Assets	205,658,000	195,748,000
Current liabilities:
Accounts payable	3,709,000	3,269,000
Customer deposits	12,702,000	6,815,000
Accrued expenses	3,103,000	3,753,000
Current operating lease liabilities	235,000	328,000
Total current liabilities	19,749,000	14,165,000
Total liabilities	19,749,000	14,165,000
Commitments and contingencies
Shareholders' equity:
Preferred stock, par value $.10 per share; 300,000 shares authorized; none issued	0	0
Capital in excess of par value	12,590,000	12,590,000
Retained earnings	171,853,000	167,527,000
Total shareholders' equity	185,909,000	181,583,000
Total Liabilities and Shareholders' Equity	205,658,000	195,748,000
Common Stock [Member]
Shareholders' equity:
Common stock	1,234,000	1,234,000
Class B Stock [Member]
Shareholders' equity:
Common stock	$ 232,000	$ 232,000