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Note 3 - Fair Value Measurements - Fair Value of Assets Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Money market funds	$ 517	$ 5,358
Fair Value, Inputs, Level 1 [Member]
Assets:
Money market funds	517	5,358
Fair Value, Inputs, Level 2 [Member]
Assets:
Money market funds
Fair Value, Inputs, Level 3 [Member]
Assets:
Money market funds

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- References

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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