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Note 4 - Property and Equipment, Net - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property and equipment and finance lease	$ 231,697	$ 210,408
Less: accumulated depreciation and amortization	(169,843)	(145,558)
Property and equipment and finance lease, net	61,854	64,850
Computer Equipment [Member]
Property and equipment and finance lease	161,809	136,286
Computer Software, Intangible Asset [Member]
Property and equipment and finance lease	25,807	26,164
Leasehold Improvements [Member]
Property and equipment and finance lease	21,092	21,107
Scanner Appliances [Member]
Property and equipment and finance lease	16,510	16,749
Furniture and Fixtures [Member]
Property and equipment and finance lease	6,479	6,599
Assets Held under Capital Leases [Member]
Property and equipment and finance lease	$ 0	$ 3,503

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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