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Note 1 - Basis of Presentation (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

Three Months Ended

  

Six Months Ended

 

June 30,

  

June 30,

 

2021

  

2020

  

2021

  

2020

 
$1  $(5) $(22) $61 

Three Months Ended

  

Six Months Ended

 

June 30,

  

June 30,

 

2021

  

2020

  

2021

  

2020

 
$116  $312  $315  $472 

Three Months Ended

  

Six Months Ended

 

June 30,

  

June 30,

 

2021

  

2020

  

2021

  

2020

 
$79  $62  $214  $66 
               
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, 2020

  196  $49.69  $35.03 

Cancelled/Forfeited

  (121) $43.63  $30.90 

Expired

  (15) $84.34  $62.02 

Balance, June 30, 2021

  60  $53.50  $36.81 
Nonvested Restricted Stock Shares Activity [Table Text Block]
  

Number of Shares (thousands)

  

Weighted Average Grant Date Fair Value Per Share

 

Unvested, December 31, 2020

  41  $31.37 

Vested/Released

  (23) $32.80 

Cancelled/Forfeited

      

Unvested, June 30, 2021

  18  $31.17 
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, 2020

  44  $33.73 

Expired

  (15) $47.40 

Unvested, June 30, 2021

  29  $26.80 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Issuance Date

Exercisable for

Expiration Date

 

Exercise Price

  

Number of Shares

 
           

August 11, 2020

Common Stock

August 11, 2025

 $0.20   1,672,290 
Schedule of Change in Asset Retirement Obligation [Table Text Block]
  

June 30, 2021

  

December 31, 2020

 

Beginning future site restoration obligation

 $7,360  $7,420 

New wells placed on production and other

  -   43 

Deletions related to property sales

  (2,845)  (216)

Deletions related to plugging costs

  (127)  (235)

Accretion expense

  180   414 

Revisions and other

  203   (66)

Ending future site restoration obligation

 $4,771  $7,360