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Note 8 - Subsequent Events (Details Textual) - USD ($)
 12 Months Ended
Mar. 22, 2021
Jan. 21, 2021
Jan. 08, 2021
Jan. 04, 2021
Jan. 02, 2020
Dec. 31, 2020
 [1]
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)           913,000 1,089,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)           $ 5.24 $ 2.26
Executives and Key Personnel [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         525,000    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 5.27    
Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         325,000    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 5.27    
Director [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         1 year    
Consultant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         15,000    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 5.27    
Consultant [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         1 year    
Subsequent Event [Member] | Executives and Key Personnel [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       417,500      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 5.16      
Subsequent Event [Member] | Executives and Key Personnel [Member] | Share-based Payment Arrangement, Option [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       1 year      
Subsequent Event [Member] | Executives and Key Personnel [Member] | Share-based Payment Arrangement, Option [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       4 years      
Subsequent Event [Member] | Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     35,000 227,500      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)     $ 5.50 $ 5.16      
Salary and Wage, Officer, Excluding Cost of Good and Service Sold     $ 60,000        
Subsequent Event [Member] | Director [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     1 year 1 year      
Subsequent Event [Member] | Nonexecutive Employees [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       23,325      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 5.16      
Subsequent Event [Member] | Nonexecutive Employees [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       1 year      
Subsequent Event [Member] | Consultant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 30,000 7,500   5,000      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 6.87 $ 5.65   $ 5.16      
Subsequent Event [Member] | Consultant [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year 1 year   1 year      
[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.