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Equity Plan - Unrecognized Compensation Cost - Nonvested Stock Options (Details) - Options
12 Months Ended
Dec. 31, 2020
USD ($)
Unrecognized Compensation Cost  
Total unrecognized compensation cost related to nonvested stock options granted $ 894,000
Expected weighted-average period for recognition of compensation costs related to nonvested stock options 2 years 7 months 17 days