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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 ($)
May 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
May 25, 2018
USD ($)
Mar. 31, 2016
JPY (¥)
Notes Payable and Long-Term Debt          
Maximum borrowing capacity $ 51,700,000       ¥ 5,500,000,000
Covenant compliance period of not having losses     2 years    
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%    
Tokyo Interbank Offered Rate (TIBOR)     0.06%    
Interest rate, effective percentage     0.46%    
Revolving Credit Facility | Line of Credit          
Notes Payable and Long-Term Debt          
Proceeds from lines of credit     $ 8,884,000    
Repayments of lines of credit     8,884,000    
Current borrowing capacity     0    
Amount available under the credit agreement     $ 51,700,000    
Subsequent Event | Line of Credit          
Notes Payable and Long-Term Debt          
Amount available under the credit agreement       $ 51,700,000  
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