Note 10 - Shareholders' Equity and Employee Benefits (Details Textual)		3 Months Ended		12 Months Ended
	May. 31, 2016 USD ($) shares	Apr. 30, 2016 USD ($)	May. 02, 2015 USD ($)	Jan. 31, 2015 CNY (¥)	Jan. 31, 2015 $ / shares
Pension Plan [Member] | Tax Deferred Savings Plan 401k [Member]
Defined Contribution Plan, Cost Recognized		$ 200,000	$ 0
Endowment Insurance Pension Plan [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount | ¥				¥ 16,353
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		8.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		21.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 600,000	500,000
Retirement Pension Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount		200,000	200,000
Severance Plan [Member]
Supplemental Unemployment Benefits, Severance Benefits		700,000
Defined Benefit Plan, Assets for Plan Benefits		700,000
Defined Contribution Plan, Employer Contribution Related to Severances, Amount		100,000	$ 100,000
Purchase Plan 2010 [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares	59,480
Costs Contingent on Rescission	$ 400,000
Cost Related to Issuance of Excess Number of Shares Reserved	$ 400,000
Purchase Plan 2010 [Member]
Share Price | $ / shares					$ 3.89
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount		18,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Additional Amount for Employees Over Age 50		$ 6,000