Note 1 - Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

Three Months Ended
March 31,
2020		2019
$	66	$	151

Three Months Ended
March 31,
2020		2019
$	160	$	143

Three Months Ended
March 31,
2020		2019
$	4	$	79

Share-based Payment Arrangement, Option, Activity [Table Text Block]

	Number of Shares			Weighted Average Option Exercise Price Per Share		Weighted Average Grant Date Fair Value Per Share
Outstanding, December 31, 2019		5,926		$	2.47	$	1.75
Forfeited		(315	)	$	2.09	$	1.53
Outstanding, March 31, 2020		5,611		$	2.49	$	1.76

Nonvested Restricted Stock Shares Activity [Table Text Block]

	Number of Shares (thousands)			Weighted Average Grant Date Fair Value Per Share
Unvested, December 31, 2019		1,781		$	1.58
Vested/Released		(77	)	$	1.59
Forfeited		(302	)	$	1.58
Unvested, March 31, 2020		1,402		$	1.58

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

	Number of Shares (thousands)			Weighted Average Grant Date Fair Value Per Share
Unvested, December 31, 2019		1,154		$	1.69
Forfeited		(188	)	$	1.72
Unvested, March 31, 2020		966		$	1.69

Schedule of Change in Asset Retirement Obligation [Table Text Block]

	March 31, 2020			December 31, 2019
Beginning future site restoration obligation	$	7,420		$	7,492
New wells placed on production and other		41			80
Deletions related to property disposals		-			(473	)
Deletions related to plugging costs		-			(890	)
Accretion expense		103			436
Revisions and other		(117	)		775
Ending future site restoration obligation	$	7,447		$	7,420