Stockholders’ Equity - Treasury Stock and Stock Repurchase Program (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2015
Equity, Class of Treasury Stock
Treasury stock purchased (in shares)	145,703	93,977
Stock surrendered for exercise of stock options (in shares)	66,115	0
Share Repurchase Program, June 2015
Equity, Class of Treasury Stock
Stock repurchase shares authorized			$ 50,000,000
Common stock shares purchased, cost	$ 0	$ 300,000

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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