Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2026	Sep. 30, 2025
Current assets:
Cash and cash equivalents	$ 43,464,000	$ 26,587,000
Marketable securities at fair value (cost of $109,533,000 at March 31, 2026 and $107,237,000 at September 30, 2025)	111,670,000	109,714,000
Accounts receivable, less allowance for credit losses of $529,000 at March 31, 2026 and $434,000 at September 30, 2025	3,932,000	3,130,000
Contract assets	7,552,000	12,208,000
Inventories, net	51,071,000	53,503,000
Prepaid expenses and other current assets	3,167,000	1,399,000
Total current assets	220,856,000	206,541,000
Property and equipment, net	11,154,000	11,079,000
Deferred income taxes	4,843,000	4,584,000
Other long-term assets	209,000	392,000
Total Assets	237,062,000	222,596,000
Current liabilities:
Accounts payable	4,834,000	1,842,000
Customer deposits	7,105,000	3,889,000
Contract liabilities	1,233,000	0
Accrued expenses	2,282,000	2,741,000
Current operating lease liabilities	156,000	339,000
Total current liabilities	15,610,000	8,811,000
Unrecognized tax benefits	2,365,000	1,983,000
Total liabilities	17,975,000	10,794,000
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	205,031,000	197,746,000
Total shareholders' equity	219,087,000	211,802,000
Total Liabilities and Shareholders' Equity	237,062,000	222,596,000
Common Stock [Member]
Shareholders' equity:
Common stock	1,234,000	1,234,000
Class B common stock [Member]
Shareholders' equity:
Common stock	$ 232,000	$ 232,000