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Note 4 - Supplement Balance Sheet Information - Finite-lived Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | ---
Finite-lived Assets, gross carrying amount | $ 135,091 | $ 74,208
Accumulated Amortization | (47,014) | (40,989)
Finite-lived Assets, net | 88,077 | 33,219
Intellectual Property [Member] |  |
Finite-lived Assets, gross carrying amount | 16,335 | 7,690
Accumulated Amortization | (6,060) | (5,301)
Finite-lived Assets, net | 10,275 | 2,389
Trade Names [Member] |  |
Finite-lived Assets, gross carrying amount | 6,136 | 3,739
Accumulated Amortization | (2,836) | (2,542)
Finite-lived Assets, net | 3,300 | 1,197
Customer Relationships [Member] |  |
Finite-lived Assets, gross carrying amount | 110,873 | 61,198
Accumulated Amortization | (36,464) | (31,584)
Finite-lived Assets, net | 74,409 | 29,614
Noncompete Agreements [Member] |  |
Finite-lived Assets, gross carrying amount | 1,747 | 1,581
Accumulated Amortization | (1,654) | (1,562)
Finite-lived Assets, net | $ 93 | $ 19

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