Registration of securities issued in business combination transactions

The following table summarizes the changes in the number of deferred stock shares under the 2011 Plan over the period December 31, 2020 to September 30, 2021: (Details)

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The following table summarizes the changes in the number of deferred stock shares under the 2011 Plan over the period December 31, 2020 to September 30, 2021: (Details) - Performance Shares [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares, Outstanding - Beginning 272,695 321,227 270,066
Weighted Average Grant Date Fair Value, Outstanding - Beginning $ 3.91 $ 3.37 $ 4.48
Shares, Granted 95,631 161,107
Weighted Average Grant Date Fair Value, Granted $ 5.33 $ 2.76
Shares, Vested (194,586) (57,952) (4,575)
Weighted Average Grant Date Fair Value, Vested $ 4.05 $ 2.81 $ 4.56
Shares, Forfeited (78,109) (86,211) (105,371)
Weighted Average Grant Date Fair Value, Forfeited $ 3.56 $ 4.22 $ 3.90
Shares, Outstanding - Ending 272,695 321,227
Weighted Average Grant Date Fair Value, Outstanding - Ending $ 3.91 $ 3.37