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Revolving Credit Facilities and Mortgage Payable - Japan Line of Credit (Details) - Revolving Credit Facility - Line of Credit - Japan Credit Facility
1 Months Ended 6 Months Ended
Mar. 31, 2016
JPY (¥)
Sep. 30, 2020
USD ($)
Mar. 31, 2016
USD ($)
Notes Payable and Long-Term Debt      
Maximum borrowing capacity ¥ 3,000,000,000   $ 28,412,000
Proceeds from lines of credit   $ 0  
Repayments of lines of credit   0  
Long-term line of credit   0  
Amount available under the credit agreement   $ 28,412,000  
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%