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Note 5 - Business Combinations - Allocation of Purchase Price for the Acquisition of Rapid (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets acquired: |  |  |  |  |
Goodwill, Ending Balance |  | $ 128,504 | $ 128,752 | $ 128,504 | $ 28,916
Liabilities assumed: |  |  |  |  |
Net cash consideration |  |  | $ 90 | 110,533 |
Rapid [Member] |  |  |  |  |
Assets acquired: |  |  |  |  |
Current assets |  | 6,720 |  | 6,720 |
Goodwill, Ending Balance | $ 99,800 | 99,836 |  | 99,836 |
Other intangible assets |  | 8,700 |  | 8,700 |
Other long-term assets |  | 8,855 |  | 8,855 |
Total assets acquired |  | 124,111 |  | 124,111 |
Liabilities assumed: |  |  |  |  |
Current liabilities |  | 2,067 |  | 2,067 |
Other long-term liabilities |  | 85 |  | 85 |
Total liabilities assumed |  | 2,152 |  | 2,152 |
Net assets acquired |  | 121,959 |  | $ 121,959 |
Cash paid |  | 115,378 |  |  |
Cash acquired |  | (4,755) |  |  |
Net cash consideration | 110,600 | 110,623 |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 11,300 | 11,336 |  |  |
Total purchase consideration | $ 121,900 | $ 121,959 |  |  |

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