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Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 498,044	$ 612,434
Bad debt expense	76,280	320,270
Receivables written off during the periods	(24,895)	(484,265)
Effect of currency translation	(16,607)	49,605
Allowance for doubtful accounts	$ 532,822	$ 498,044

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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X

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
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X

- Definition

Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency, which decreases (increases) the allowance for loan and lease losses.

+ References

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X

- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

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