Note 8 - Share-based Compensation and Cash-based Incentive Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

	Restricted Stock Units
				Weighted Average
				Grant Date Fair
	Units			Value Per Unit
Nonvested, December 31, 2019		1,614,722		$	5.73
Forfeited		(51,915	)		6.10
Nonvested, September 30, 2020		1,562,807			5.71

Schedule of Nonvested Restricted Stock Units, Vesting Schedule [Table Text Block]

	Restricted Stock Units
2020	787,203
2021	775,604
Total	1,562,807

Nonvested Restricted Stock Shares Activity [Table Text Block]

	Restricted Shares
				Weighted Average
				Grant Date Fair
	Shares			Value Per Share
Nonvested, December 31, 2019		123,180		$	4.55
Granted		109,376			2.53
Vested		(78,428	)		3.57
Nonvested, September 30, 2020		154,128		$	3.61

Schedule of Nonvested Restricted Stock, Vesting Schedule [Table Text Block]

	Restricted Shares
2021	138,676
2022	15,452
Total	154,128

Share-based Payment Arrangement, Cost by Plan [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Share-based compensation expense from:
Restricted stock units (1)	$	927	$	1,178	$	2,854	$	2,219
Restricted Shares		148		70		288		210
Total	$	1,075	$	1,248	$	3,142	$	2,429

Schedule of Incentive Compensation Expense [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Share-based compensation included in:
General and administrative expenses	$	1,075	$	1,248	$	3,142	$	2,429
Cash-based incentive compensation included in:
Lease operating expense (1)		—		672		849		951
General and administrative expenses (1)		154		1,679		3,944		5,017
Total charged to operating income	$	1,229	$	3,599	$	7,935	$	8,397