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Note 3 - Acquisitions - Acquired Intangible Assets (Details) - USD ($) $ in Thousands | Nov. 11, 2019 | Aug. 08, 2019 | Apr. 01, 2019 | Nov. 12, 2019 | Aug. 07, 2019 | Mar. 31, 2019
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Astero [Member] |  |  |  |  |  |
Intangible assets |  |  | $ 4,120 |  |  |
Astero [Member] | Customer Relationships [Member] |  |  |  |  |  |
Intangible assets |  |  | $ 160 |  |  | $ 160
Intangible assets, estimated useful life (Year) |  |  | 4 years |  |  |
Astero [Member] | Trade Names [Member] |  |  |  |  |  |
Intangible assets |  |  | $ 470 |  |  | 470
Intangible assets, estimated useful life (Year) |  |  | 9 years |  |  |
Astero [Member] | Developed Technology Rights [Member] |  |  |  |  |  |
Intangible assets |  |  | $ 2,840 |  |  | 2,840
Astero [Member] | Developed Technology Rights [Member] | Minimum [Member] |  |  |  |  |  |
Intangible assets, estimated useful life (Year) |  |  | 5 years |  |  |
Astero [Member] | Developed Technology Rights [Member] | Maximum [Member] |  |  |  |  |  |
Intangible assets, estimated useful life (Year) |  |  | 9 years |  |  |
Astero [Member] | In Process Research and Development [Member] |  |  |  |  |  |
Intangible assets |  |  | $ 650 |  |  | $ 650
Intangible assets, estimated useful life (Year) |  |  | 9 years |  |  |
SAVSU [Member] |  |  |  |  |  |
Intangible assets |  | $ 12,150 |  |  |  |
SAVSU [Member] | Customer Relationships [Member] |  |  |  |  |  |
Intangible assets |  | $ 80 |  |  | $ 80 |
Intangible assets, estimated useful life (Year) |  | 6 years |  |  |  |
SAVSU [Member] | Trade Names [Member] |  |  |  |  |  |
Intangible assets |  | $ 1,320 |  |  | 1,320 |
Intangible assets, estimated useful life (Year) |  | 9 years |  |  |  |
SAVSU [Member] | Developed Technology Rights [Member] |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 10,750 |
SAVSU [Member] | Technology-Based Intangible Assets [Member] |  |  |  |  |  |
Intangible assets |  | $ 10,750 |  |  |  |
SAVSU [Member] | Technology-Based Intangible Assets [Member] | Minimum [Member] |  |  |  |  |  |
Intangible assets, estimated useful life (Year) |  | 7 years |  |  |  |
SAVSU [Member] | Technology-Based Intangible Assets [Member] | Maximum [Member] |  |  |  |  |  |
Intangible assets, estimated useful life (Year) |  | 8 years |  |  |  |
CBS Acquisition [Member] |  |  |  |  |  |
Intangible assets | $ 6,790 |  |  | $ 6,800 |  |
CBS Acquisition [Member] | Customer Relationships [Member] |  |  |  |  |  |
Intangible assets | $ 560 |  |  |  |  |
Intangible assets, estimated useful life (Year) | 6 years |  |  |  |  |
CBS Acquisition [Member] | Trade Names [Member] |  |  |  |  |  |
Intangible assets | $ 800 |  |  |  |  |
Intangible assets, estimated useful life (Year) | 6 years |  |  |  |  |
CBS Acquisition [Member] | Developed Technology Rights [Member] |  |  |  |  |  |
Intangible assets | $ 5,430 |  |  |  |  |
Intangible assets, estimated useful life (Year) | 9 years |  |  |  |  |

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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=121600890&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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