Note 4 - Supplemental Balance Sheet Information (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	$ 8,413	$ 10,653	$ 7,405
Restricted Cash and Cash Equivalents, Total	84	91
Depreciation, Total	$ 2,906	2,340
Number of Reporting Units	5
Goodwill, Impairment Loss	$ 0
Finite-Lived Intangible Asset, Expected Amortization, Year One	1,286
Finite-Lived Intangible Asset, Expected Amortization, Year Two	938
Finite-Lived Intangible Asset, Expected Amortization, Year Three	927
Finite-Lived Intangible Asset, Expected Amortization, Year Four	927
Finite-Lived Intangible Asset, Expected Amortization, Year Five	783
NETHERLANDS
Restricted Cash and Cash Equivalents, Total	$ 84	$ 91

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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