Condensed Consolidated Balance Sheets - USD ($)	Dec. 31, 2021	Sep. 30, 2021
Current assets:
Cash and cash equivalents	$ 21,248,000	$ 23,232,000
Marketable securities at fair value (cost of $94,329,000 at December 31, 2021 and $93,690,000 at September 30, 2021)	95,682,000	94,976,000
Accounts receivable, less allowance for doubtful accounts of $378,000 at December 31, 2021 and $321,000 at September 30, 2021	3,376,000	2,622,000
Costs and estimated earnings in excess of billings	1,225,000	1,903,000
Inventories, net	45,734,000	41,888,000
Prepaid expenses and other current assets	3,372,000	2,202,000
Total current assets	170,637,000	166,823,000
Property and equipment, net	12,051,000	11,801,000
Other long-term assets	778,000	838,000
Total Assets	183,466,000	179,462,000
Current liabilities:
Accounts payable	4,455,000	3,105,000
Customer deposits	8,697,000	5,244,000
Accrued expenses	2,167,000	2,645,000
Current operating lease liabilities	417,000	393,000
Total current liabilities	15,736,000	11,387,000
Deferred and other income taxes	407,000	394,000
Non-current operating lease liabilities	308,000	392,000
Total liabilities	16,451,000	12,173,000
Commitments and contingencies
Shareholders' equity:
Preferred stock, par value $.10 per share; 300,000 shares authorized; none issued
Capital in excess of par value	12,590,000	12,590,000
Retained earnings	152,959,000	153,233,000
Total shareholders' equity	167,015,000	167,289,000
Total Liabilities and Shareholders' Equity	183,466,000	179,462,000
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