Note 15 - Concentrations of risks (Details) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash	$ 6,624,600	$ 8,968,814
Banks in China
Cash	994,735
SDIC
Deposit Insurance Scheme	57,000
DI Scheme
Cash	$ 5,487,399
Customer One
Concentration Risk, Customer	one	one	one
Customer One \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Concentration Risk, Percentage	48.70%	66.60%	64.20%
Customer Two
Concentration Risk, Customer	one	one
Customer Two \| Customer Concentration Risk
Concentration Risk, Customer	16.4%	23.9%
Vendor
Concentration Risk, Supplier	one	two	one
Vendor \| Supplier Concentration Risk \| Accounts Payable
Concentration Risk, Percentage	14.80%	1380.00%	2360.00%
Vendor \| Purchase Benchmark \| Supplier Concentration Risk
Concentration Risk, Percentage	1000.00%	1000.00%	1000.00%
Concentration Risk, Additional Characteristic	no	no	no
Vendor Two \| Supplier Concentration Risk \| Accounts Payable
Concentration Risk, Percentage		1240.00%

Represents the monetary amount of Insurance Coverage for Cash deposits, as of the indicated date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

For an entity that discloses a concentration risk as a percentage of some financial balance or benchmark, this item identifies a second characteristic of the concentration. For example, "Europe" is the second characteristic in the phrase: "net assets in Europe are 70 percent of total net assets".

+ References

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- Definition

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

Description of risks that arise due to the volume of business transacted with a particular supplier or reliance placed on that supplier. At a minimum, the description informs financial statement users of the general nature of the risk.

+ References

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