Represents period by which accounts receivable are due.

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Expiration term of each operating loss carry forward included in operating loss carry forward.

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Research and development expense to government grant.

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Significant Accounting Policies [Line Items]

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount of allowance for credit loss on accounts receivable.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

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No definition available.

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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.

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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced.

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Amount of valuation reserve for inventory.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Summary of significant accounting policies (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Significant Accounting Policies [Line Items]
FDIC limit of insurable cash	$ 250,000
Letters of credit outstanding, amount	569,052		$ 746,792
Allowance for doubtful accounts receivable	20,753		20,753
Inventory valuation reserves	104,670		288,378
Impairment charge	55,496
Amortization of intangible assets	197,842	$ 66,954
Impairment of finite-lived intangible assets		$ 750,596
Goodwill	7,694,401		8,024,729
Finite-lived intangible assets, fair value	$ 0
Antidilutive securities excluded from computation of earnings per share, amount	11,000,000	1,100,000
Research and development expense to government grant	$ 219,222
Earned but not yet received	$ 609,490		413,530
Minimum [Member]
Significant Accounting Policies [Line Items]
Accounts receivable period due	30 days
Maximum [Member]
Significant Accounting Policies [Line Items]
Accounts receivable period due	90 days
Domestic Country [Member]
Significant Accounting Policies [Line Items]
Operating loss carryforwards			196,511,928	$ 188,282,298
Operating loss carryforwards, expiration terms	begin to expire in 2022
Foreign [Member]
Significant Accounting Policies [Line Items]
Operating loss carryforwards			160,540,528
Operating loss carryforwards, foreign subsidiaries			$ 138,576,755
Customer One [Member] \| Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration risk, percentage	11.00%		20.00%
Customer One [Member] \| Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration risk, percentage	18.00%	41.00%
Customer Two [Member] \| Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration risk, percentage	12.00%
Customer Two [Member] \| Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration risk, percentage	13.00%
Customer Three [Member] \| Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration risk, percentage	22.00%