Quarterly report pursuant to Section 13 or 15(d)

Schedule of Stock Options Roll Forward (Details) (Parenthetical)

v3.21.2
Schedule of Stock Options Roll Forward (Details) (Parenthetical) - $ / shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Stock Option Outstanding [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Stock option exercise price per share lower limit $ 2.79 $ 2.79
Stock option exercise price per share upper limit 7.50 $ 8.40
Stock Option Exercisable [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Stock option exercise price per share lower limit 2.79  
Stock option exercise price per share upper limit $ 7.29