Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Allowance	$ 11	$ 157
Common Stock Class A
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	140,000,000	140,000,000
Common stock, shares issued (in shares)	34,831,118	33,981,185
Common stock, shares outstanding (in shares)	34,831,118	33,981,185
Common Stock Class B
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	35,000,000	35,000,000
Common stock, shares issued (in shares)	15,657,089	15,647,095
Common stock, shares outstanding (in shares)	15,657,089	15,647,095