Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2021	Sep. 30, 2020
Current Assets:
Cash and cash equivalents	$ 27,544,000	$ 35,584,000
Marketable securities at fair value (cost $93,077,000 at June 30, 2021 and $89,514,000 at September 30, 2020)	95,345,000	89,498,000
Accounts receivable, less allowance for doubtful accounts of $307,000 at June 30, 2021 and $442,000 at September 30, 2020	3,120,000	1,992,000
Costs and estimated earnings in excess of billings	0	6,405,000
Inventories, net	40,832,000	27,090,000
Prepaid expenses and other current assets	1,233,000	1,189,000
Total Current Assets	168,074,000	161,758,000
Property and equipment, net	12,251,000	8,341,000
Other long-term assets	948,000	995,000
Total Assets	181,273,000	171,094,000
Current Liabilities:
Accounts payable	4,406,000	1,728,000
Customer deposits	3,761,000	3,853,000
Billings in excess of costs and estimated earnings	685,000	0
Accrued expenses and other current liabilities	2,874,000	2,605,000
Current operating lease liabilities	403,000	328,000
Total Current Liabilities	12,129,000	8,514,000
Deferred and other income taxes	1,203,000	746,000
Non-current operating lease liabilities	491,000	614,000
Total Liabilities	13,823,000	9,874,000
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	12,386,000	12,331,000
Retained earnings	153,602,000	147,428,000
Total Shareholders' Equity	167,450,000	161,220,000
Total Liabilities and Shareholders' Equity	181,273,000	171,094,000
Common Stock [Member]
Shareholders' equity:
Common stock	1,230,000	1,229,000
Total Shareholders' Equity	1,230,000	1,229,000
Class B Stock [Member]
Shareholders' equity:
Common stock	232,000	232,000
Total Shareholders' Equity	$ 232,000	$ 232,000