Note 4 - Supplemental Balance Sheet Information (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance	$ 5,713	$ 8,413	$ 10,653
Restricted Cash and Cash Equivalents, Total	79	84
Depreciation, Total	$ 3,177	2,906
Number of Reporting Units	2
Goodwill, Impairment Loss	$ 0
Year 1	907
Year 2	897
Year 3	897
Year 4	767
Year 5	767
NETHERLANDS
Restricted Cash and Cash Equivalents, Total	$ 79	$ 84

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. 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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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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