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

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

No definition available.

Name:	us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant