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Note 11 - Capital Stock (Details Textual)			3 Months Ended			4 Months Ended	8 Months Ended	12 Months Ended	18 Months Ended
	Jun. 02, 2020 USD ($) shares	May 28, 2020 $ / shares shares	Mar. 31, 2021 USD ($) shares	Jun. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Aug. 20, 2019 USD ($) shares	Dec. 31, 2020 shares	Aug. 20, 2019 USD ($) shares	Mar. 18, 2020 shares	Aug. 13, 2019 USD ($)	Feb. 28, 2018 USD ($)
Payments of Stock Issuance Costs | $			$ 108,863		$ 2,252
Class of Warrant or Right, Outstanding (in shares) | shares			105,556					105,556
Warrants for Common Class B Stock [Member]
Class of Warrant or Right, Outstanding (in shares) | shares			104,772
Warrants for Common Class A Stock [Member]
Class of Warrant or Right, Outstanding (in shares) | shares			784
Common Class A [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares										20,000,000
Stock Repurchased During Period, Shares (in shares) | shares								0
Common Stock, Voting Rights Per Share			1
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) | shares				40,455	0	448,880
Proceeds from Issuance of Common Stock | $				$ 669,751		$ 9,450,789
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) | 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) | shares	3,680,000
Proceeds from Issuance of Common Stock | $	$ 58,900,000
Share Offering, Number of Shares Authorized (in shares) | shares		3,200,000
Share Price (in dollars per share) | $ / shares		$ 16.00
Stock Option, Exercisable, Remaining Contractual Term (Day)		30 days
Stock Option, Number of Securities Called by Each Stock Option (in shares) | 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) | shares		39,375
Common Class B [Member]
Common Stock, Voting Rights Per Share			10

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