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Note 6 - Supplemental Balance Sheet Information (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents, Total	$ 288	$ 351
Grant [Member]
Revenues, Total	61
CHINA
Restricted Cash, Total	205	266
NETHERLANDS
Restricted Cash and Cash Equivalents, Total	$ 83	$ 85

X

- Definition

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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