Note 7 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended March 31,
	2022			2021
Stock-based compensation expense, gross	$	5		$	4
Income tax benefit at our statutory rate associated with stock-based compensation		(1	)		(1	)
Stock-based compensation expense, net	$	4		$	3

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Three Months Ended March 31,
	2022					2021
				Weighted-					Weighted-
				Average					Average
	Number			Grant Date		Number			Grant Date
	of			Fair Value		of			Fair Value
	Shares			Per Share		Shares			Per Share
Restricted common stock:
Outstanding - beginning of period		1,035,728		$	19.69		917,533		$	16.84
Granted (1)		333,382			22.16		296,042			18.21
Vested		(294,558	)		18.56		(502,241	)		16.10
Outstanding - end of period		1,074,552		$	20.76		711,334		$	17.94
Restricted Class A common stock:
Outstanding - beginning of period		720,421		$	18.22		480,042		$	16.10
Granted (1)		250,448			20.52		233,425			17.67
Vested		(229,758	)		16.99		(248,539	)		15.00
Outstanding - end of period		741,111		$	19.38		464,928		$	17.47
Restricted stock units - common stock:
Outstanding - beginning of period		125,247		$	19.02		90,184		$	18.92
Granted		259,079			23.87		95,115			19.05
Vested		(108,921	)		19.03		(60,052	)		18.92
Forfeited		(1,260	)		19.05		-			-
Outstanding - end of period		274,145		$	23.60		125,247		$	19.02