Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share and Other Equity Related Information - Narrative (Details)

v3.20.1
Earnings Per Share and Other Equity Related Information - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Aug. 31, 2019
Feb. 28, 2017
Apr. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Stock options excluded from calculation of dilutive shares as the effect would be anti-dilutive (in shares) 431,000 293,000      
Stock-based compensation expense $ 429,000 $ 385,000      
Stock Options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Non-vested stock options unrecognized compensation expense $ 10,757,000        
Non-vested stock options unrecognized compensation expense, weighted-average period of recognition 3 years        
Options granted in period (in shares) 196        
Stock options, contractual period 10 years        
Stock options, vesting period 5 years        
Common Class A          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Stock repurchase program, authorized amount (up to)     $ 17,553,000 $ 15,000,000 $ 10,000,000
Treasury Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Open market purchase of common shares (in shares) 455 0