Export Sales and Major Customers (Details) - USD ($) | 3 Months Ended |
May. 31, 2015 | May. 31, 2014 |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | $ 2,383,000 | $ 2,305,000 |
Power Transistors [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 473,000 | 429,000 |
Hybrids [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 1,149,000 | 1,273,000 |
Field Effect Transistors [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 99,000 | 117,000 |
Power MOSFETS [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 662,000 | 486,000 |
Europe and Australia [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 6,000 | 333,000 |
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 | 329,000 |
Europe and Australia [Member] | Field Effect Transistors [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 6,000 | 4,000 |
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 | 9,000 | 23,000 |
Canada and Latin America [Member] | Power Transistors [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 9,000 | 23,000 |
Canada and Latin America [Member] | Hybrids [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 0 | 0 |
Canada and Latin America [Member] | Field Effect Transistors [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 0 | 0 |
Canada and Latin America [Member] | Power MOSFETS [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 0 | 0 |
Far East and Middle East [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 100,000 | 74,000 |
Far East and Middle East [Member] | Power Transistors [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 0 | 0 |
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 | 14,000 | 74,000 |
Far East and Middle East [Member] | Power MOSFETS [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 86,000 | 0 |
United States [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 2,268,000 | 1,875,000 |
United States [Member] | Power Transistors [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 464,000 | 406,000 |
United States [Member] | Hybrids [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 1,149,000 | 944,000 |
United States [Member] | Field Effect Transistors [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | 79,000 | 39,000 |
United States [Member] | Power MOSFETS [Member] | | |
Revenues from domestic and export sales to unaffiliated customers | | |
Revenues, Total | $ 576,000 | $ 486,000 |