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Note 12 - Capital Stock (Details Textual) - USD ($)			2 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended		18 Months Ended
	May 15, 2018	Mar. 06, 2018	May 15, 2018	Dec. 31, 2019	Aug. 20, 2019	Dec. 31, 2019	Dec. 31, 2018	Aug. 20, 2019	Aug. 13, 2019	Aug. 03, 2018	May 04, 2018	Feb. 28, 2018	Feb. 22, 2018	Dec. 31, 2017
Proceeds from Issuance of Common Stock						$ 32,204,732	$ 27,245,682
Payments of Stock Issuance Costs						$ 1,023,490	$ 1,614,555
Common Stock, Shares Authorized											40,000,000
Preferred Stock, Shares Authorized				1,000,000		1,000,000	1,000,000				1,000,000
Class of Warrant or Right, Outstanding				105,556		105,556	105,556							105,556
Common Class A [Member]
Sale of Stock, Value, Available to Issue													$ 150,000,000
Sale of Stock, Price Per Share													$ 23.30
Share Price													$ 23.29
Stock Issued During Period, Shares, New Issues	3,137,768	3,300,000
Proceeds from Issuance of Common Stock	$ 73,110,000	$ 76,890,000	$ 150,000,000
Common Stock, Shares Authorized				38,838,884		38,838,884	38,838,884				38,838,884
Class of Warrant or Right, Outstanding				784		784
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
Common Class A [Member] | Shelf Registration [Member] | Cowen and Company LLC [Member]
Stock Issued During Period, Shares, New Issues				448,880	942,223			2,141,452
Proceeds from Issuance of Common Stock				$ 9,450,789	$ 22,753,943			$ 49,999,625
Sale of Stock, Shelf Registration, Value, Available to Issue									$ 75,000,000
Compensation, Percentage of Common Stock Sales									3.00%			3.00%
Proceeds from Issuance of Common Stock, Net				9,122,227	22,059,015
Payments of Stock Issuance Costs				$ 328,562	$ 694,928
Common Class B [Member]
Common Stock, Shares Authorized				1,161,116		1,161,116	1,161,116				1,161,116
Class of Warrant or Right, Outstanding				104,772		104,772
Class of Warrant or Right, Number of Securities Called by Warrants or Rights										784

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