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Note 8 - Stock Transactions and Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended 160 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Nov. 30, 2005
Stock Repurchase Program, Number of Shares Authorized to be Repurchased         300,000
Stock Repurchased During Period, Value $ 0 $ 0 $ 0    
Stock Repurchased During Period, Shares       162,486  
Share-based Payment Arrangement, Cumulative Increase in Expense 945,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 10,895,000 6,309,000 7,574,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 2,400,000 $ 1,927,000 $ 1,432,000    
Share-based Payment Arrangement, Option [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 5,661,000     $ 5,661,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 3 years 109 days        
Restricted Stock Units (RSUs) [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 4,018,000     $ 4,018,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 36 days        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number 28     28  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 163.93     $ 163.93  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 171.13 $ 136.26 $ 122.98    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 460,000 $ 123,000 $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 31 8,000   31  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 3        
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 192.99        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 10     10  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 1,050        
Performance Shares [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage 0.00%        
Performance Shares [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage 400.00%        
Equity Plan 2014 [Member]          
Common Stock, Capital Shares Reserved for Future Issuance 1,100,000     1,100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 613,893     613,893  
Equity Plan 2014 [Member] | Share-based Payment Arrangement, Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years        
Equity Plan 2014 [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years