Note 2 - Summary of Significant Accounting Policies - Financial Assets and Liabilities Measured at Fair value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands |
Jun. 30, 2018 |
Jun. 30, 2017 |
---|---|---|
Cash and cash equivalents | $ 2,600 | $ 5,932 |
Fair Value, Inputs, Level 1 [Member] | ||
Cash and cash equivalents | 2,600 | 5,932 |
Fair Value, Inputs, Level 2 [Member] | ||
Cash and cash equivalents | ||
Fair Value, Inputs, Level 3 [Member] | ||
Cash and cash equivalents |