Note 18 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	Number of			Weighted Average
	Shares			Grant Date Fair Value
Nonvested at December 31, 2019		453,336		$	34.60
Granted		1,257,152		$	7.81
Vested		(172,429	)	$	31.86
Forfeited		(49,098	)	$	12.42
Nonvested at December 31, 2020		1,488,961		$	13.07

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

	Number of			Weighted Average
	Shares			Grant Date Fair Value
Nonvested at December 31, 2019		193,265		$	33.55
Granted		229,440		$	8.60
Vested		(33,665	)	$	30.95
Forfeited		(52,195	)	$	38.66
Nonvested at December 31, 2020		336,845		$	17.81