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Note 5 - Goodwill and Intangible Assets, Net - Other Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Carrying Amount $ 170,620 $ 169,123
Accumulated Amortization (53,094) (49,252)
Net 117,526 119,871
Intellectual Property [Member]    
Carrying Amount 20,500 15,731
Accumulated Amortization (7,150) (6,454)
Net 13,350 9,277
Trade Names [Member]    
Carrying Amount 8,351 5,839
Accumulated Amortization (2,923) (2,855)
Net 5,428 2,984
Customer Relationships [Member]    
Carrying Amount 140,472 146,106
Accumulated Amortization (41,857) (38,777)
Net 98,615 107,329
Noncompete Agreements [Member]    
Carrying Amount 1,297 1,447
Accumulated Amortization (1,164) (1,166)
Net $ 133 $ 281