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Note 5 - Supplemental Balance Sheet Information (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance | $ 10,653 | $ 7,405 | $ 25,934
Restricted Cash and Cash Equivalents, Total | 91 | 270 |
Revenues, Total | 107,712 | 106,795 |
Depreciation, Total | $ 2,340 | 2,220 |
Number of Reporting Units | 5 |  |
Goodwill, Impairment Loss | $ 0 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year One | 352 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Two | 337 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Three | 334 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Four | 324 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Five | 324 |  |
Grant [Member] |  |  |
Revenues, Total | 188 |  |
NETHERLANDS |  |  |
Restricted Cash and Cash Equivalents, Total | $ 91 | 82 |
CHINA |  |  |
Restricted Cash and Cash Equivalents, Total |  | $ 188 |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586 + Details
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