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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Apr. 01, 2019
USD ($)
Number of Operating Segments 4      
Accounts Receivable, Credit Loss Expense (Reversal) $ 1 $ 13 $ 17  
Payments to Acquire Businesses, Net of Cash Acquired, Total $ 184,102 $ 4,840 $ 15,518  
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset       $ 1,461
Operating Lease, Liability, Total       $ 1,411
Equity Plan 2014 [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year      
Equity Plan 2014 [Member] | Share-based Payment Arrangement, Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 6 years      
Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year) 3 years      
Minimum [Member] | Equity Plan 2014 [Member] | Share-based Payment Arrangement, Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 4 years      
Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year) 16 years      
Maximum [Member] | Equity Plan 2014 [Member] | Share-based Payment Arrangement, Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 5 years