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Note G - Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
     
 
 
    
 
 
  
Weighted- Average
    
 
 
     
 
 
  
Weighted-
  
Remaining
  
Aggregate
   
Number of
  
Average
  
Contractual
  
Intrinsic Value
In thousands
  
Shares
  
Exercise Price
  
Term (Years)
  
(Thousands)
Options outstanding at December 31, 2018
  
171,369
   $
60.66
    
 
      
 
  
                                 
Granted in 2019
  
31,906
  
1.57
    
 
      
 
  
Exercised in 2019
  
—
  
—
    
 
    
—
Unvested options forfeited in 2019
  
(25,392
 )  
10.00
    
 
      
 
  
Vested options expired in 2019
  
(51,187
 )  
59.84
    
 
      
 
  
Options outstanding at December 31, 2019
  
126,696
   $
57.48
    
 
      
 
  
Adjustment and Correction  
(7,500
 )  
53.61
    
 
      
 
  
Granted in 2020  
—
  
—
    
 
      
 
  
Exercised in 2020  
—
  
—
    
 
    
—
Unvested options forfeited in 2020  
—
  
—
    
 
      
 
  
Vested options expired in 2020  
(31,449
 )  
90.89
    
 
      
 
  
Options outstanding at December 31, 2020
  
87,747
   $
40.25
  
5.46
  
—
                                 
Vested and expected to vest at December 31, 2020
  
87,747
   $
40.25
  
5.46
  
—
                                 
Exercisable at December 31, 2020
  
80,336
   $
43.28
  
5.25
  
—
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
Range of
  
Number
  
Weighted-Average
  
Weighted-Average
  
Number
  
Weighted-Average
Exercise Prices
  
Outstanding
  
Exercise Price
  
Remaining Life (Years)
  
Exercisable
  
Exercise Price
$1.57 - 7.40
 
46,727
   $
3.42
  
8.32
  
39,316
   $
2.67
$76.80 - 115.2
 
39,320
  
80.43
  
2.30
  
39,320
  
80.43
$123.10 - 184.65
 
1,700
  
123.10
  
0.10
  
1,700
  
123.10
 
 
87,747
   $
40.25
  
5.46
  
80,336
   $
43.28
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Year Ended December 31,
  
   
2020
    
2019
  
Expected term (in years)
    
—
      
5.50
  
Expected stock price volatility
    
—
      
40.53
 %
Risk-free interest rate
    
—
      
1.86
 %
Share-based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block]
     
 
 
    
 
 
  
Weighted-Average
     
 
 
  
Weighted-
  
Remaining
   
Number of
  
Average
  
Contractual Term
   
Units
  
Grant Price
  
(Years)
Cash stock appreciation rights outstanding at December 31, 2018
  
12,676
   $
9.70
  
8.48
                         
Granted in 2019
  
—
  
—
    
 
  
Exercised in 2019
  
—
  
—
    
 
  
Expired in 2019
  
—
  
—
    
 
  
Forfeited in 2019
  
—
  
—
    
 
  
Cash stock appreciation rights outstanding at December 31, 2019
  
12,676
   $
9.70
  
7.48
                         
Granted in 2020
  
—
  
—
    
 
  
Exercised in 2020
  
—
  
—
    
 
  
Expired in 2020
  
(9,507
 )  
9.70
    
 
  
Forfeited in 2020
  
(3,169
 )  
9.70
    
 
  
Cash stock appreciation rights outstanding at December 31, 2020
  
—
   $
—
  
—
                         
Vested balance at December 31, 2020
  
—
   $
—
  
—
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
     
 
 
  
Weighted-
   
Number of
  
Average Grant
   
Shares
  
Date Fair Value
Unvested shares outstanding at December 31, 2018
  
107,415
   $
9.98
                 
Granted in 2019
  
383,569
  
3.26
Settled in 2019
  
(39,858
 )  
9.65
Forfeited in 2019
  
(22,835
 )  
10.07
Unvested shares outstanding at December 31, 2019
  
428,291
   $
3.99
Adjustment and Correction  
13,158
  
3.99
Granted in 2020  
730,150
  
2.02
Settled in 2020  
(303,020
 )  
3.96
Forfeited in 2020  
(78,870
 )  
3.46
Unvested shares outstanding at December 31, 2020
  
789,709
   $
2.22
Schedule of Share-based Compensation, Phantom Shares, Outstanding Activity [Table Text Block]
     
 
 
  
Weighted-
   
Number of
  
Average Grant
   
Units
  
Date Fair Value
Phantom stock units outstanding at December 31, 2018
  
32,811
   $
14.39
                 
Granted in 2019
  
—
  
—
Settled in 2019
  
(11,449
 )  
16.01
Forfeited in 2019
  
(6,542
 )  
13.49
Phantom stock units outstanding at December 31, 2019
  
14,820
   $
13.55
Adjustment and Correction  
(786
 )    
 
  
Granted in 2020
  
—
  
—
Settled in 2020  
(8,032
 )  
16.40
Forfeited in 2020  
(1,656
 )  
9.70
Phantom stock units outstanding at December 31, 2020
  
4,346
   $
9.70
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
     
 
 
  
Weighted-
   
Number of
  
Average Grant-
   
Units
  
Date Fair Value
Performance stock units outstanding at December 31, 2018
  
38,529
   $
10.50
                 
Granted in 2019
  
417,035
  
2.67
Settled in 2019
  
—
  
—
Forfeited in 2019
  
(247,635
 )  
3.36
Performance stock units outstanding at December 31, 2019
  
207,929
   $
3.27
Adjustment and Correction  
(52,632
 )  
—
Granted in 2020
  
—
    
 
  
Settled in 2020  
(4,225
 )  
9.70
Forfeited in 2020  
(118,804
 )  
2.79
Performance stock units outstanding at December 31, 2020  
32,268
   $
4.14
Schedule of Cash Performance Units, Activity [Table Text Block]
     
 
 
  
Weighted-
   
Number of
  
Average Grant-
   
Shares
  
Date Fair Value
Cash performance stock units outstanding at December 31, 2018
  
3,778
   $
26.90
                 
Granted in 2019
  
—
  
—
Settled in 2019
  
—
  
—
Forfeited in 2019
  
(3,778
 )  
26.90
Cash performance stock units outstanding at December 31, 2019
  
—
  
—
                 
Granted in 2020
  
—
  
—
Settled in 2020
  
—
  
—
Forfeited in 2020
  
—
  
—
Cash performance stock units outstanding at December 31, 2020
  
—
   $
—