Note 5 - Customer and Supplier Concentrations (Detail) - Suppliers Comprising 10 Percent or More of the Company’s Gross Accounts Receivable (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Total gross accounts receivable due from suppliers (in Dollars)	$ 1,111	$ 1,156
Total gross accounts receivable due from suppliers	100.00%	100.00%
Balance (in Dollars)	1,073	1,130
Percentage	97.00%	98.00%
Power Systems Technologies, Ltd. [Member]
Balance (in Dollars)	951	1,008
Percentage	86.00%	87.00%
Zheng Ge Electrical Company Ltd [Member]
Balance (in Dollars)	$ 122	$ 122
Percentage	11.00%	11.00%