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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