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Note 11 - Capital Stock (Details Textual) - USD ($)			3 Months Ended	4 Months Ended	6 Months Ended	8 Months Ended	9 Months Ended		18 Months Ended
	Jun. 02, 2020	May 28, 2020	Sep. 30, 2020	Dec. 31, 2019	Jun. 30, 2020	Aug. 20, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 20, 2019	Mar. 18, 2020	Aug. 13, 2019	Feb. 28, 2018
Proceeds from Issuance of Common Stock							$ 59,549,751	$ 29,229,522
Payments of Stock Issuance Costs							$ 3,417,323	$ 924,742
Class of Warrant or Right, Outstanding (in shares)			105,556	105,556			105,556
Warrants for Common Class B Stock [Member]
Class of Warrant or Right, Outstanding (in shares)			104,772				104,772
Warrants for Common Class A Stock [Member]
Class of Warrant or Right, Outstanding (in shares)			784				784
Common Class A [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)										20,000,000
Stock Repurchased During Period, Shares (in shares)							0
Common Class A [Member] | Shelf Registration [Member]
Sale of Stock, Shelf Registration, Value, Available to Issue												$ 200,000,000
Sale of Stock, Shelf Registration, Value, Incremental Amount Available to Issue												$ 50,000,000
Stock Issued During Period, Shares, New Issues (in shares)			0	448,880	40,455
Proceeds from Issuance of Common Stock				$ 9,450,789	$ 669,751
Proceeds from Issuance of Common Stock, Net				9,122,227
Payments of Stock Issuance Costs				$ 328,562
Common Class A [Member] | Shelf Registration [Member] | Cowen and Company LLC [Member]
Sale of Stock, Shelf Registration, Value, Available to Issue											$ 75,000,000
Compensation, Percentage of Common Stock Sales											3.00%	3.00%
Stock Issued During Period, Shares, New Issues (in shares)						942,223			2,141,452
Proceeds from Issuance of Common Stock						$ 22,753,943			$ 49,999,625
Proceeds from Issuance of Common Stock, Net						22,059,015
Payments of Stock Issuance Costs						$ 694,928
Common Class A [Member] | Underwriting Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,680,000
Proceeds from Issuance of Common Stock	$ 58,900,000
Share Offering, Number of Shares Authorized (in shares)		3,200,000
Share Price (in dollars per share)		$ 16.00
Stock Option, Exercisable, Remaining Contractual Term (Day)		30 days
Stock Option, Number of Securities Called by Each Stock Option (in shares)		480,000
Common Class A [Member] | Underwriting Agreement [Member] | Adam Peterson and Alex Rozek, a Board Member, and Employee [Member]
Stock Issued During Period, Shares, New Issues (in shares)		39,375

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- Definition

The percentage amount given to the seller or agent in regards to the sale of common stock they facilitate, measured as a percentage of the common stock sold.

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The amount, at each sale, that the company is allowed to offer and sell in accordance with the shelf registration.

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The remaining contractual term of exercisable stock options in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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