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Note 12 - Short-term Bank Loan and Credit Facility
 12 Months Ended
Dec. 31, 2020
Notes to Financial Statements  
Short-term Debt [Text Block]
12.
 Short-term bank loan and credit facility
 
As of
December 31, 2019,
the Company had a revolving credit facility of
RMB5.0
million (approximately
US$0.7
million) for short-term working capital loans granted by a major financial institution in China, which expired in
January 2020.
 
As of
December 31, 2019,
under the revolving credit facility, the Company borrowed
RMB3.0
million (approximately
US$0.43
million) short-term bank loan, which matured and was repaid in
January 2020.