Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
CPA®:18 – Global stockholders’ equity:
Preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (shares)	50,000,000	50,000,000
Preferred stock, shares issued (shares)	0	0
Class A common stock
CPA®:18 – Global stockholders’ equity:
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (shares)	320,000,000	320,000,000
Common stock, shares outstanding (shares)	118,684,766	119,059,188
Class C common stock
CPA®:18 – Global stockholders’ equity:
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (shares)	80,000,000	80,000,000
Common stock, shares outstanding (shares)	30,600,539	32,096,796