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Taxes - Components of deferred tax assets and liabilities (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Allowance for doubtful accounts and other markdown and impairments	$ 7,622,322	$ 4,464,601
Valuation allowance	(7,622,322)	(4,464,601)
Total	0	0
Deferred tax liability:
Increase in fair value of intangible assets acquired through acquisition	2,129,517	1,905,442
Impairment of intangible assets acquired through acquisition	(2,129,517)	(1,905,442)
Total	$ 0	$ 0

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- Definition

Impairment of intangible assets acquired through acquisition.

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- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123427490&loc=d3e31931-109318

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

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-Publisher FASB
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-Topic 740
-SubTopic 10
-Section 50
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from allowance for credit loss on accounts receivable.

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-Publisher FASB
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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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