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Note 14 - Stockholders' Equity (Details Textual) - USD ($)			9 Months Ended
	Feb. 19, 2021	Jul. 09, 2015	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Sep. 30, 2019
Stock Issued During Period, Shares, New Issues (in shares)		6,459,948
Proceeds from Issuance of Common Stock			$ 0	$ 4,415,103
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 4.82		$ 7.28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)			0	0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total						$ 0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)			1,387,368
Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	150,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 8.75
Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	2,000,000
Shares Issued, Price Per Share (in dollars per share)	$ 7.00
Proceeds from Issuance of Common Stock	$ 14,000,000