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Note 6 - Goodwill and Other Acquired Intangible Assets, Net (Tables) | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | The following table shows the changes in the carrying amount of goodwill for the year-to-date periods ended December 31, 2018 and March 31, 2019:
(In thousands) | Goodwill |  | Accumulated Impairment Losses |  | Net
Balance at December 31, 2017 | $ | 197,391 |  |  | $ | (186,469 | ) |  | $ | 10,922 |
Goodwill acquired | 3,170 |  |  | — |  |  | 3,170 |
Balance at December 31, 2018 | 200,561 |  |  | (186,469 | ) |  | 14,092 |
Goodwill acquired | 538 |  |  | — |  |  | 538 |
Balance at March 31, 2019 | $ | 201,099 |  |  | $ | (186,469 | ) |  | $ | 14,630 |
Schedule of Other Intangible Assets, Future Amortization Expense [Table Text Block] | The estimated aggregate amortization expense for the remainder of 2019 and thereafter is as follows (in thousands):
2019 | $ | 6,416 |
2020 | 7,236 |
2021 | 5,822 |
2022 | 5,290 |
2023 | 4,839 |
2024 and thereafter | 12,578 |
Total | $ | 42,181 |
Schedule of Other Intangible Assets [Table Text Block] | The following is a summary of the gross and net carrying amounts and accumulated amortization of our other acquired intangible assets as of the periods indicated:
| March 31, 2019
(In thousands) | Original Amount Acquired |  | Accumulated Amortization and Impairment |  | Net Carrying Amount
Client relationships | $ | 83,860 |  |  | $ | (49,751 | ) | (1) | $ | 34,109 |
Technology | 16,964 |  |  | (13,575 | ) | (2) | 3,389 |
Trade name and trademarks | 8,340 |  |  | (4,080 | ) |  | 4,260 |
Non-competition agreements | 185 |  |  | (179 | ) |  | 6 |
Licenses | 463 |  |  | (46 | ) |  | 417 |
Total | $ | 109,812 |  |  | $ | (67,631 | ) |  | $ | 42,181 |
| December 31, 2018
(In thousands) | Original Amount Acquired |  | Accumulated Amortization |  | Net Carrying Amount
Client relationships | $ | 84,000 |  |  | $ | (48,227 | ) | (1) | $ | 35,773 |
Technology | 17,362 |  |  | (13,141 | ) | (2) | 4,221 |
Trade name and trademarks | 8,340 |  |  | (3,864 | ) |  | 4,476 |
Non-competition agreements | 185 |  |  | (177 | ) |  | 8 |
Licenses | 463 |  |  | (35 | ) |  | 428 |
Total | $ | 110,350 |  |  | $ | (65,444 | ) |  | $ | 44,906 |
______________________
(1) | Includes an impairment charge of $14.9 million in the quarter ended June 30, 2017.
(2) Includes an impairment charge of $0.9 million in the quarter ended June 30, 2017.

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