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Revolving Credit Facilities and Mortgage Payable - Japan Line of Credit (Details) - Japan Credit Facility
1 Months Ended 2 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
May 17, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2016
JPY (¥)
Notes Payable and Long-Term Debt        
Maximum borrowing capacity $ 49,595,000     ¥ 5,500,000,000
Maximum        
Notes Payable and Long-Term Debt        
Debt instrument term 6 months      
Tokyo Interbank Offered Rate (TIBOR)        
Notes Payable and Long-Term Debt        
Spread on variable interest rate (as a percent) 0.40%      
Interest rate, effective percentage     0.46%  
Revolving Credit Facility | Line of Credit        
Notes Payable and Long-Term Debt        
Proceeds from lines of credit     $ 0  
Repayments of lines of credit     0  
Current borrowing capacity     0  
Amount available under the credit agreement     $ 49,595,000  
Subsequent Event | Line of Credit        
Notes Payable and Long-Term Debt        
Amount available under the credit agreement   $ 49,595,000    
Long-term line of credit   0    
Subsequent Event | Revolving Credit Facility | Line of Credit        
Notes Payable and Long-Term Debt        
Proceeds from lines of credit   $ 0