The amount of reclassification of warrant financing expenses.

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Expected vesting term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format.

+ References

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Note 3 - Summary of Accounting Policies (Details Textual) - USD ($)		6 Months Ended
	Jan. 01, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Stockholders' Equity Attributable to Parent, Ending Balance		$ 144,071,902	$ 139,701,399	$ 27,167,932	$ 8,374,306	$ 10,896,337	$ 13,156,005
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent, Ending Balance		$ (119,204,948)	$ (112,165,700)	(111,898,992)	$ (100,924,602)	$ (97,018,460)	$ (94,071,040)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity Attributable to Parent, Ending Balance				13,003,075
Cumulative Effect, Period of Adoption, Adjustment [Member] \| Retained Earnings [Member]
Stockholders' Equity Attributable to Parent, Ending Balance				$ 3,271,361
Accounting Standards Update 2020-06 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity Attributable to Parent, Ending Balance	$ 13,003,075
Reclassification of Warrant Financing Expenses	938,794
Fair Value Adjustment of Warrants	2,332,567
Accounting Standards Update 2020-06 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| Retained Earnings [Member]
Stockholders' Equity Attributable to Parent, Ending Balance	$ 3,271,361
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Vesting Term (Year)		1 year
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Vesting Term (Year)		4 years
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		10 years