Export Sales and Major Customers (Details) (USD $)	3 Months Ended
	Nov. 30, 2014	Nov. 30, 2013
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	$ 2,418,000	$ 2,115,000
Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	338,000	279,000
Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	1,481,000	984,000
Field Effect Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	76,000	126,000
Power MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	523,000	726,000
Europe and Australia [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	123,000	221,000
Europe and Australia [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	2,000	0
Europe and Australia [Member] | Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	121,000	196,000
Europe and Australia [Member] | Field Effect Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	0
Europe and Australia [Member] | Power MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	25,000
Canada and Latin America [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	8,000	35,000
Canada and Latin America [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	8,000	22,000
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	13,000
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	122,000	47,000
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	16,000	0
Far East and Middle East [Member] | Power MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	106,000	47,000
United States [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	2,165,000	1,812,000
United States [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	328,000	257,000
United States [Member] | Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	1,360,000	788,000
United States [Member] | Field Effect Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	60,000	113,000
United States [Member] | Power MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	$ 417,000	$ 654,000