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Note 4 - Supplemental Balance Sheet Information (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Restricted Cash and Cash Equivalents, Total	$ 88		$ 91
Depreciation, Total	730	$ 579
Amortization of Intangible Assets, Total	154	149
Research and Development Expense [Member]
Amortization of Intangible Assets, Total	33	31
Selling, General and Administrative Expenses [Member]
Amortization of Intangible Assets, Total	121	$ 118
NETHERLANDS
Restricted Cash and Cash Equivalents, Total	$ 88		$ 91

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of cash and cash equivalents 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. Cash equivalents include, but are not limited to, 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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