Annual report pursuant to Section 13 and 15(d)

Note 11 - Shareholders' Equity (Details Textual)

v3.20.4
Note 11 - Shareholders' Equity (Details Textual) - USD ($)
 12 Months Ended
Aug. 10, 2020
Feb. 13, 2020
Dec. 31, 2020
Dec. 31, 2019
Stock Issued During Period, Shares, New Issues (in shares) 4,600,000 2,125,000    
Shares Issued, Price Per Share (in dollars per share) $ 5 $ 4    
Proceeds from Issuance of Common Stock $ 23,000,000 $ 8,500,000 $ 28,805,000
Proceeds from Issuance of Common Stock, Net $ 21,100,000 $ 7,700,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)     14,283  
Stock Issued During Period, Value, Stock Options Exercised     $ 45,161 $ 75,000
Private Placement [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)       50,000
Stock Issued During Period, Value, Stock Options Exercised       $ 75,000
Warrants Issued in Private Placement [Member]        
Stock Issued During Period, Shares, Exercise of Common Stock Warrants (in shares)     0 0