Note 3 - Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands |
Apr. 29, 2017 |
Jan. 28, 2017 |
| Total assets measured at fair value |
$ 8,843
|
$ 8,799
|
| Cash equivalents and short-term investments |
8,525
|
8,496
|
| Restricted cash |
318
|
303
|
| Fair Value, Inputs, Level 1 [Member] |
|
|
| Total assets measured at fair value |
8,843
|
8,799
|
| Cash equivalents and short-term investments |
8,525
|
8,496
|
| Restricted cash |
318
|
303
|
| Money Market Funds [Member] |
|
|
| Cash equivalents and short-term investments |
5,744
|
3,715
|
| Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Cash equivalents and short-term investments |
5,744
|
3,715
|
| Corporate Bond Securities [Member] |
|
|
| Cash equivalents and short-term investments |
1,500
|
3,505
|
| Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Cash equivalents and short-term investments |
1,500
|
3,505
|
| Fixed Income Investments [Member] |
|
|
| Cash equivalents and short-term investments |
1,281
|
1,276
|
| Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Cash equivalents and short-term investments |
$ 1,281
|
$ 1,276
|