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Note 3 - Supplemental Balance Sheet Information (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance |  | $ 25,934 | $ 18,330 | $ 10,706
Revenues, Total | [1] | 87,190 | 85,531 |
Construction in Progress, Gross |  | 2,870 | 5,136 |
Depreciation, Total |  | $ 1,972 | 2,005 |
Number of Reporting Units |  | 4 |  |
Goodwill, Impairment Loss |  | $ 0 | $ 0 |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 362 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  | 349 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  | 330 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 315 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | 312 |  |
Grant [Member] |  |  |  |
Revenues, Total |  | $ 97 |  |
[1] | Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects

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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=109223946&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=109223946&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=98513485&loc=SL98516268-108586 + Details
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