Export Sales and Major Customers (Details) - USD ($)	6 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	$ 2,212,000	$ 2,305,000
Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	246,000	341,000
Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	1,176,000	1,241,000
Field Effect Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	247,000	54,000
Power MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	543,000	669,000
Europe and Australia [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	3,000	453,000
Europe and Australia [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	0
Europe and Australia [Member] | Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	453,000
Europe and Australia [Member] | Field Effect Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	3,000	0
Europe and Australia [Member] | Power MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	0
Canada and Latin America [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	24,000
Canada and Latin America [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0
Canada and Latin America [Member] | Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0
Canada and Latin America [Member] | Field Effect Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	24,000
Canada and Latin America [Member] | Power MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0
Far East and Middle East [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	79,000	201,000
Far East and Middle East [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	4,000	4,000
Far East and Middle East [Member] | Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	0
Far East and Middle East [Member] | Field Effect Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	15,000	3,000
Far East and Middle East [Member] | Power MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	60,000	194,000
United States [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	2,106,000	1,651,000
United States [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	242,000	337,000
United States [Member] | Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	1,176,000	788,000
United States [Member] | Field Effect Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	205,000	51,000
United States [Member] | Power MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	$ 483,000	$ 475,000