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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Unbilled Receivables, Expected Billing Period (Year) | 1 year |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 4 years |  |
Research and Development Expense, Total | $ 49,200 | $ 48,900 | $ 60,000
Advertising Expense | 12,000 | 8,500 | 10,700
Goodwill, Impairment Loss | $ 0 | $ 0 | $ 0
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 4 years |  |
First Option to Extend Corporate Headquarters [Member] |  |  |
Lessee, Leases, Number of Extensions | 1 |  |
Lessee, Lease, Extension Lease Term (Year) | 10 years |  |
Second Option to Extend Corporate Headquarters [Member] |  |  |
Lessee, Leases, Number of Extensions | 2 |  |
Lessee, Lease, Extension Lease Term (Year) | 5 years |  |
Hyderabad, India Office [Member] |  |  |
Lessee, Leases, Termination Period (Month) | 6 months |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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