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Equity Plans (Tables)
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Compensation Costs Charged to Income and Proceeds from the Exercise of Any Restricted Stock and Similar Instruments that are Recorded to Additional Paid-In Capital and Common Stock, by Award Type A summary of compensation costs charged to income and proceeds from the exercise of any restricted stock and similar instruments that are recorded to additional paid-in capital and common stock, by award type, are presented below for the three months ended March 31, 2021, and 2020.
 Three months ended March 31,
 20212020
Adjustments to additional paid-in capital and common stock for:
Compensation costs charged to income:
   ESPP$181 171 
   Restricted stock and deferred restricted stock1,099 80 
Total compensation costs charged to income$1,280 251 
ESPP proceeds$1,026 970