Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual)	3 Months Ended
	Jun. 30, 2023 USD ($) shares
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	15,133
UNITED STATES
Cash, Uninsured Amount	$ 33,000
HONG KONG
Cash, Uninsured Amount	2,200,000
CHINA
Restricted Cash	$ 3,800,000