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Note 3 - Fair Value Disclosures - Summary of Assets Measured On a Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
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Mar. 31, 2015
|
| Financial instruments owned: |
|
| Securities |
$ 19,720 |
| Fair Value, Measurements, Recurring [Member] |
|
| Financial instruments owned: |
|
| Money market funds |
4,351 |
|
24,071 |
| Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |
|
| Financial instruments owned: |
|
| Money market funds |
4,351 |
|
5,851 |
| Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |
|
| Financial instruments owned: |
|
|
18,220 |
| Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |
|
| Financial instruments owned: |
|
| Securities |
4,711 |
| Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |
|
| Financial instruments owned: |
|
| Securities |
4,711 |
| US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |
|
| Financial instruments owned: |
|
| Securities |
13,509 |
| US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |
|
| Financial instruments owned: |
|
| Securities |
13,509 |
| US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] |
|
| Financial instruments owned: |
|
| Securities |
1,500 |
| US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |
|
| Financial instruments owned: |
|
| Securities |
$ 1,500 |