Quarterly report pursuant to Section 13 or 15(d)

Short-Term Borrowings and Credit Lines (Narrative) (Details)

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Short-Term Borrowings and Credit Lines (Narrative) (Details) - Mar. 31, 2021 - Japanese Subsidiary [Member]
USD ($)
JPY (¥)
Unsecured And Uncommitted Credit Line1    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity | $ $ 7,000,000.0  
Unsecured And Uncommitted Credit Line2    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity | ¥   ¥ 1,500,000,000
Unsecured And Uncommitted Credit Line3    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity | ¥   ¥ 400,000,000.0
Unsecured And Uncommitted Credit Lines 1, 2, And 3    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity | $ $ 24,200,000