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Note 6 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Outstanding, shares (in shares) 3,860,390 3,552,890  
Outstanding, weighted average exercise price (in dollars per share) $ 1.76 $ 1.57  
Weighted-average remaining contractual term, outstanding (Year) 5 years 7 months 20 days 5 years 8 months 8 days 5 years 21 days
Aggregate intrinsic value, outstanding $ 13,701,610 $ 13,287,932 $ 1,149,461
Granted, shares (in shares) 913,000 [1] 1,089,000  
Granted, weighted average exercise price (in dollars per share) $ 5.24 [1] $ 2.26  
Exercised, shares (in shares) (135,000) [2] (781,500)  
Exercised, weighted average exercise price (in dollars per share) $ 1.89 [2] $ 1.60  
Expired, shares (in shares) 0 0  
Expired, weighted average exercise price (in dollars per share) $ 0 $ 0  
Canceled, shares (in shares) 0 0  
Canceled, weighted average exercise price (in dollars per share) $ 0 $ 0  
Outstanding, shares (in shares) 4,638,390 3,860,390 3,552,890
Outstanding, weighted average exercise price (in dollars per share) $ 2.44 $ 1.76 $ 1.57
Exercisable, shares (in shares) 3,284,794    
Exercisable, weighted average exercise price (in dollars per share) $ 1.78    
Weighted-average remaining contractual term, exercisable (Year) 4 years 5 months 19 days    
Aggregate intrinsic value, exercisable $ 11,886,680    
[1] Represents the following stock options granted: Annual share-based compensation awards on January 2, 2020, including: (a) 525,000 stock options with an exercise price of $5.27 per share granted to executives and key personnel, vesting upon one year anniversary, or annually in equal installments over four years,(b) 325,000 stock options with an exercise price of $5.27 per share granted to members of the Board of Directors, vesting upon one year anniversary, (c) 23,000 stock options with an exercise price of $5.27 per share granted to employees, vesting annually in equal installments over four years, and (d) 15,000 stock options with an exercise price of $5.27 per share granted to a consultant, vesting upon one year anniversary. One-time awards on March 22, 2020, including 25,000 stock options to a contractor with an exercise price of $3.99 per share, vesting in six months from the date of grant.
[2] Represents the following stock options exercised: A total of 135,000 stock options exercised with a weighted average market price of $1.89.