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Note 19 - Concentration of Risk (Details Textual) | Jun. 30, 2021
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CHINA |
Percent of Cash and Cash Equivalents Held by Major Financial Institutions | 41.00%
UNITED STATES |
Percent of Cash and Cash Equivalents Held by Major Financial Institutions | 59.00%

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- Definition Represents the percentage of cash and cash equivalents held by major financial institutions. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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Data Type: | na
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- Details
Name: | srt_StatementGeographicalAxis=country_US
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Data Type: | na
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