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Note 11 - Capital Stock (Details Textual) - USD ($)		1 Months Ended	3 Months Ended		4 Months Ended	8 Months Ended	18 Months Ended
	May 08, 2020	May 08, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Aug. 20, 2019	Aug. 20, 2019	Mar. 18, 2020	Aug. 13, 2019	Feb. 28, 2018
Proceeds from Issuance of Common Stock				$ 3,864,701
Payments of Stock Issuance Costs			$ 2,252	$ 124,563
Class of Warrant or Right, Outstanding (in shares)			105,556		105,556
Warrants for Common Class B Stock [Member]
Class of Warrant or Right, Outstanding (in shares)			104,772
Warrants for Common Class A Stock [Member]
Class of Warrant or Right, Outstanding (in shares)			784
Common Class A [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)								20,000,000
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
Proceeds from Issuance of Common Stock					$ 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] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	40,455	40,455
Proceeds from Issuance of Common Stock	$ 669,751
Proceeds from Issuance of Common Stock, Net		$ 649,659
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

X

- 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 cash outflow for cost incurred directly with the issuance of an equity security.

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-Topic 230
-SubTopic 10
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