Condensed Consolidated Balance Sheets Parentheticals - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Treasury Stock, Shares	244,113	244,113
Class A common stock
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	150,000,000	150,000,000
Common Stock, Shares, Issued	27,754,061	27,538,474
Common Stock, Shares, Outstanding	27,509,948	27,294,361
Class B common stock
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	50,000,000	50,000,000
Common Stock, Shares, Issued	13,176,695	13,176,695
Common Stock, Shares, Outstanding	13,176,695	13,176,695