Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock-based Compensation (Details Textual)

v3.21.2
Note 6 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 01, 2016
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   1,262,500 1,515,000 1,220,000 1,220,000 1,262,500 1,220,000 1,395,000 1,349,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   127,500 145,000 10,000 0 272,500 10,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)   360,000 25,000 0   385,000 0    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 210,230       $ 210,230      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)           5 months      
Share-based Payment Arrangement, Expense   $ 111,862   $ 356   $ 139,573 $ 806    
The 2016 Stock Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 1,000,000                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   828,500       828,500      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)   346,000       346,000      
The 2006 Stock Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   1,950,000       1,950,000      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)           10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   434,000       434,000      
Minimum [Member] | Share-based Payment Arrangement, Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)           6 months      
Maximum [Member] | Share-based Payment Arrangement, Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)           2 years