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Note 15 - Subsequent Event (Details Textual) - Oct. 26, 2021 $ in Millions | USD ($) | CNY (¥)
--- | --- | ---
Foreign Exchange Contract [Member] | Subsequent Event [Member] |  |
Derivative, Amount of Hedged Item | $ 18.6 | ¥ 119,812,500

X
- Definition Amount of hedged item in hedging relationship. Excludes hedged asset or liability. + References No definition available. + Details
Name: | us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |