Note 4 - Inventories - Schedule of Inventory (Details) - USD ($)	Nov. 30, 2024	Feb. 29, 2024
Inventory, Gross	$ 8,847,000	$ 8,916,000
Inventory, Valuation Reserves	(4,849,000)	(4,784,000)
Inventory, Net	3,998,000	4,132,000
Raw Materials [Member]
Inventory, Gross	2,589,000	2,492,000
Inventory, Valuation Reserves	(482,000)	(441,000)
Inventory, Net	2,107,000	2,051,000
Work-in-process [Member]
Inventory, Gross	5,160,000	5,274,000
Inventory, Valuation Reserves	(3,883,000)	(3,894,000)
Inventory, Net	1,277,000	1,380,000
Finished Goods [Member]
Inventory, Gross	1,098,000	1,150,000
Inventory, Valuation Reserves	(484,000)	(449,000)
Inventory, Net	$ 614,000	$ 701,000