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Note 11 - Debt Financing (Details Textual)
¥ in Thousands
Jan. 08, 2021
USD ($)
Apr. 17, 2020
USD ($)
Jun. 19, 2019
USD ($)
Dec. 31, 2020
USD ($)
Oct. 19, 2018
USD ($)
Oct. 19, 2018
CNY (¥)
Restricted Cash, Total       $ 1,966,000    
Revolving Credit Facility [Member] | JPM Chase [Member]            
Line of Credit Facility, Maximum Borrowing Capacity     $ 5,500,000      
Cash Collateral for Borrowed Securities     $ 5,500,000      
Line of Credit Facility, Commitment Fee Percentage     0.25%      
Revolving Credit Facility [Member] | JPM Chase [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate     3.00%      
The BMO Harris Agreement [Member]            
Debt Instrument, Cash Collateral, Percentage Of Face Amount Of Outstanding Debt     105.00%      
Letters of Credit Outstanding, Amount       1,873,000    
Restricted Cash, Total       $ 1,966,000    
The BMO Harris Agreement [Member] | Standby Letters of Credit [Member]            
Debt Instrument, Interest Rate, Stated Percentage     2.50%      
The China Facility [Member]            
Cash Collateral for Borrowed Securities         $ 520,000  
The China Facility [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity         $ 382,000 ¥ 2,625
Paycheck Protection Program CARES Act [Member]            
Proceeds from Issuance of Long-term Debt, Total   $ 1,556        
Paycheck Protection Program CARES Act [Member] | Subsequent Event [Member]            
Debt Instrument, Decrease, Forgiveness $ 1,556