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Note 12 - Short-term Bank Loan and Credit Facility (Details Textual)
$ in Thousands, ¥ in Millions
3 Months Ended
Sep. 29, 2019
USD ($)
Sep. 29, 2019
CNY (¥)
Jul. 29, 2019
USD ($)
Jul. 29, 2019
CNY (¥)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Short-term Bank Loans and Notes Payable [1]         $ 891   $ 874
Restricted Cash and Cash Equivalents, Total         $ 30    
Maximum [Member]              
Short-term Debt, Weighted Average Interest Rate, at Point in Time         5.655% 5.655%  
Debt Instrument, Basis Spread on Variable Rate         30.00%    
VIEs [Member]              
Short-term Bank Loans and Notes Payable         $ 891   $ 874
VIEs [Member] | Loans Payable [Member]              
Short-term Bank Loans and Notes Payable         700 ¥ 5.0  
VIEs [Member] | Loan Payable Borrowed on August 16, 2017 [Member]              
Short-term Bank Loans and Notes Payable         450 3.0  
VIEs [Member] | Loan Payable Borrowed on September 30, 2018 [Member]              
Short-term Bank Loans and Notes Payable         $ 450 ¥ 3.0  
VIEs [Member] | Loan Payable Borrowed on September 30, 2018 [Member] | Forecast [Member]              
Repayments of Short-term Debt, Total $ 220 ¥ 1.5 $ 220 ¥ 1.5      
[1] All of the VIEs' assets can be used to settle obligations of their primary beneficiary. Liabilities recognized as a result of consolidating these VIEs do not represent additional claims on the Company's general assets (Note 2).