Condensed Consolidated Balance Sheets - USD ($)	Dec. 31, 2025	Sep. 30, 2025
Current assets:
Cash and cash equivalents	$ 36,731,000	$ 26,587,000
Marketable securities at fair value (cost of $108,356,000 at December 31, 2025 and $107,237,000 at September 30, 2025)	111,003,000	109,714,000
Accounts receivable, less allowance for credit losses of $498,000 at December 31, 2025 and $434,000 at September 30, 2025	3,498,000	3,130,000
Contract assets	5,091,000	12,208,000
Inventories, net	53,249,000	53,503,000
Prepaid expenses	2,919,000	1,399,000
Total current assets	212,491,000	206,541,000
Property and equipment, net	11,510,000	11,079,000
Deferred income taxes	4,611,000	4,584,000
Other long-term assets	301,000	392,000
Total Assets	228,913,000	222,596,000
Current liabilities:
Accounts payable	1,991,000	1,842,000
Customer deposits	6,022,000	3,889,000
Accrued expenses	3,286,000	2,741,000
Current operating lease liabilities	248,000	339,000
Total current liabilities	11,547,000	8,811,000
Unrecognized tax benefits	2,122,000	1,983,000
Total liabilities	13,669,000	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	201,188,000	197,746,000
Total shareholders' equity	215,244,000	211,802,000
Total Liabilities and Shareholders' Equity	228,913,000	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