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Note 17 - Subsequent Events (Details Textual) - USD ($)			1 Months Ended
Note 17 - Subsequent Events (Details Textual) - USD ($)	Jan. 19, 2021	Jan. 01, 2021	Jun. 30, 2021	Mar. 17, 2021	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019	Jan. 18, 2021	Dec. 31, 2020	Apr. 20, 2020	Apr. 15, 2020	Jan. 01, 2020	Dec. 31, 2019	Nov. 26, 2019	Jan. 01, 2019	Dec. 31, 2018
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)													2,473,785
Sublease Agreement for Relocation of Headquarters [Member] \| Forecast [Member]
Lessee, Operating Lease, Rent Abatement			$ 19,000
The 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)						263,993	2,044
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)									1,451,246			1,451,246		1,187,253	6,958	4,914
Series A-2 and Series B-2 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)										$ 6.371
Warrants and Rights Outstanding, Term (Year)										5 years
Series A and Series B Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)											$ 6.10		$ 15.50
Subsequent Event [Member] \| Sublease Agreement for Relocation of Headquarters [Member]
Lessee, Operating Lease, Renewal Term (Month)				2 years 300 days
Subsequent Event [Member] \| Sublease Agreement for Relocation of Headquarters First Year Extension [Member]
Lessee, Operating Lease, Monthly Gross Rent				$ 21,028
Subsequent Event [Member] \| Sublease Agreement for Relocation of Headquarters Second Year Extension [Member]
Lessee, Operating Lease, Monthly Gross Rent				21,643
Subsequent Event [Member] \| Sublease Agreement for Relocation of Headquarters Third Year Extension [Member]
Lessee, Operating Lease, Monthly Gross Rent				$ 22,258
Subsequent Event [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					690,000
Subsequent Event [Member] \| The 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)		307,705
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		1,758,951
Subsequent Event [Member] \| Series C Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance (in shares)					0
Subsequent Event [Member] \| Series A-2 and Series B-2 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 3.40							$ 6.371
Subsequent Event [Member] \| Series A and Series B Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 3.40							$ 6.10
Subsequent Event [Member] \| Class A Units [Member] \| Warrants Issued in Connection with Class A Units [Member]
Warrants Per Unit (in shares)	1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 3.40
Warrants and Rights Outstanding, Term (Year)	5 years
Subsequent Event [Member] \| Class B Units [Member] \| Warrants Issued in Connection with Class B Units [Member]
Warrants Per Unit (in shares)	1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 3.40
Warrants and Rights Outstanding, Term (Year)	5 years
January 2021 Offering [Member] \| Subsequent Event [Member]
Proceeds from Issuance or Sale of Equity, Total	$ 27,600,000
Shares Issued, Price Per Share (in dollars per share)	$ 3.40
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs	$ 25,223,000
January 2021 Offering [Member] \| Subsequent Event [Member] \| Series C Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)	2,450,880
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)	1
January 2021 Offering [Member] \| Subsequent Event [Member] \| Class A Units [Member]
Units Issued, Shares (in shares)	4,607,940
Shares Issued, Price Per Share (in dollars per share)	$ 3.40
Common Shares Per Unit (in shares)	1
January 2021 Offering [Member] \| Subsequent Event [Member] \| Class B Units [Member]
Units Issued, Shares (in shares)	2,450,880
Shares Issued, Price Per Share (in dollars per share)	$ 3.40
Series C Convertible Preferred Stock Per Unit (in shares)	1
Over-Allotment Option [Member] \| Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,058,820
Over-Allotment Option [Member] \| Subsequent Event [Member] \| Warrants Issued in Connection with January 2021 Offering [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	1,058,820