Export Sales and Major Customers (Details) (USD $)	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	$ 1,966,000	$ 2,112,000
Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	346,000	352,000
Field Effect Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	860,000	963,000
Power Transistors One [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	89,000	111,000
MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	671,000	686,000
Europe and Australia [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	283,000	27,000
Europe and Australia [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	0
Europe and Australia [Member] | Field Effect Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	273,000	0
Europe and Australia [Member] | Power Transistors One [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	10,000	27,000
Europe and Australia [Member] | 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	22,000	16,000
Canada and Latin America [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	22,000	14,000
Canada and Latin America [Member] | Field Effect Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	0
Canada and Latin America [Member] | Power Transistors One [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	2,000
Canada and Latin America [Member] | 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	85,000	57,000
Far East and Middle East [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	3,000	0
Far East and Middle East [Member] | Field Effect Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	0	0
Far East and Middle East [Member] | Power Transistors One [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	7,000	3,000
Far East and Middle East [Member] | MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	75,000	54,000
United States [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	1,576,000	2,012,000
United States [Member] | Power Transistors [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	321,000	338,000
United States [Member] | Field Effect Hybrids [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	587,000	963,000
United States [Member] | Power Transistors One [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	72,000	79,000
United States [Member] | MOSFETS [Member]
Revenues from domestic and export sales to unaffiliated customers
Revenues, Total	$ 596,000	$ 632,000