Quarterly report pursuant to Section 13 or 15(d)

Note 15 - Subsequent Events (Details Textual)

v3.21.1
Note 15 - Subsequent Events (Details Textual) - USD ($)
3 Months Ended
May 13, 2021
Mar. 31, 2021
Mar. 31, 2020
Jan. 19, 2021
Jan. 18, 2021
Apr. 20, 2020
Proceeds from Issuance of Common Stock   $ 25,122,000      
Series A-2 and Series B-2 Warrants [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 3.40 $ 6.371 $ 6.371
Subsequent Event [Member] | Purchase Agreement with LPC [Member]            
Stock Issued During Period, Shares, New Issues (in shares) 250,000          
Shares Issued, Price Per Share (in dollars per share) $ 2.817          
Proceeds from Issuance of Common Stock $ 704,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 2.817