Note 9 - Employee Benefits (Details Textual)
|
3 Months Ended |
12 Months Ended |
|
Apr. 29, 2017
USD ($)
$ / shares
shares
|
Apr. 30, 2016
USD ($)
|
Mar. 31, 2018
CNY (¥)
|
Mar. 31, 2017
CNY (¥)
|
| Purchase Plan 2010 [Member] |
|
|
|
|
| Share Issued Under Employee Stock Purchase Plan, Subject to Rescission Rights | shares |
40,582
|
|
|
|
| Share Price | $ / shares |
$ 3.89
|
|
|
|
| General and Administrative Expense [Member] | Fiscal 2018 Plan [Member] |
|
|
|
|
| Restructuring Charges |
$ 400,000
|
|
|
|
| General and Administrative Expense [Member] | Fiscal 2018 Plan [Member] | One-time Termination Benefits [Member] |
|
|
|
|
| Restructuring Charges |
200,000
|
|
|
|
| Severance Plan [Member] |
|
|
|
|
| Defined Contribution Plan, Employer Contribution Related to Severances, Amount |
100,000
|
$ 100,000
|
|
|
| Supplemental Unemployment Benefits, Severance Benefits |
900,000
|
|
|
|
| Severance Employee Funds |
$ 800,000
|
|
|
|
| Domestic Plan [Member] | Endowment Insurance Pension Plan [Member] |
|
|
|
|
| Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |
8.00%
|
|
|
|
| Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |
20.00%
|
|
|
|
| Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount | ¥ |
|
|
|
¥ 17,817
|
| Defined Contribution Plan, Employer Discretionary Contribution Amount |
$ 600,000
|
600,000
|
|
|
| Domestic Plan [Member] | Endowment Insurance Pension Plan [Member] | Scenario, Forecast [Member] |
|
|
|
|
| Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount | ¥ |
|
|
¥ 19,512
|
|
| Denmark, Taiwan, The Netherlands and Germany [Member] | Retirement Pension Plan [Member] |
|
|
|
|
| Defined Contribution Plan, Cost |
|
200,000
|
|
|
| Defined Contribution Plan, Employer Discretionary Contribution Amount |
200,000
|
|
|
|
| Pension Plan [Member] | Domestic Plan [Member] |
|
|
|
|
| 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
|
|
|
|
| Defined Contribution Plan, Employer Discretionary Contribution Amount |
$ 200,000
|
$ 200,000
|
|
|