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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual)
2 Months Ended 12 Months Ended
Jun. 02, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Number of Operating Segments   4    
Revenue from Contract with Customer, Excluding Assessed Tax, Total [1]   $ 103,135,000 $ 96,179,000 [2] $ 93,665,000 [2]
Net Cash Provided by (Used in) Operating Activities, Total   30,554,000 25,719,000 [3] 17,304,000 [3]
Net Cash Provided by (Used in) Financing Activities, Total   (21,672,000) (9,024,000) [3] 1,154,000 [3]
Accounts Receivable, Credit Loss Expense (Reversal)   13,000 17,000 68,000
Payments to Acquire Businesses, Net of Cash Acquired, Total   4,840,000 15,518,000 8,622,000
Enterprise Resource Planning System Implementation Costs [Member]        
Capitalized Contract Cost, Gross   206,000    
Capitalized Contract Cost, Amortization   $ 41,000    
Capitalized Contract Cost, Amortization Period   2 years    
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset   $ 1,400,000,000    
Operating Lease, Liability, Total   $ 1,400,000    
Subsequent Event [Member]        
Payments to Acquire Businesses, Net of Cash Acquired, Total $ 2,804,000      
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Equity Plan 2014 [Member] | Share-based Payment Arrangement, Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   6 years    
Equity Plan 2014 [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period   3 years    
Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life   3 years    
Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life   16 years    
Product [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax, Total   $ 81,798,000 74,386,000 [2] 73,510,000 [2]
Service [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax, Total   $ 21,337,000 21,793,000 [2] 20,155,000 [2]
Restatement Adjustment [Member]        
Net Cash Provided by (Used in) Operating Activities, Total     (905) (9,554)
Net Cash Provided by (Used in) Financing Activities, Total     905 9,554
Restatement Adjustment [Member] | Product [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax, Total     2,214 2,455
Restatement Adjustment [Member] | Service [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax, Total     $ (2,214) $ (2,455)
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.
[2] Product and service revenues for the years ended March 31, 2018 and March 31, 2017 were reclassified to align with the current year presentation See Note 2. "Revenue Recognition."
[3] Contingent consideration has been reclassified to align with current year presentation.