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Note S - Stock Options (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Number of Options
    
Weighted
average
    
Weighted
average
remaining
    
Aggregate
  
   
2004
Plan
    
2015
Plan
    
Non
Plan
    
Total
    
exercise
price
    
life
(in years)
    
intrinsic
value
  
                                                         
Outstanding, as of December 31, 2018
  
 
4,167
    
 
47,740
    
 
146,596
    
 
198,503
    
$
21.76
    
 
 
 
  
 
 
 
Granted
    
—
      
30,167
      
—
      
30,167
      
9.36
      
 
      
 
  
Exercised
    
—
      
—
      
—
      
—
      
—
      
 
      
 
  
Forfeited
    
—
      
(5,077
)
    
(521
)
    
(5,598
)
    
18.16
      
 
      
 
  
Expired
    
(261
)
    
(1,839
)
    
(2,005
)
    
(4,105
)
    
24.64
      
 
      
 
  
Outstanding, as of December 31, 2019
  
 
3,906
    
 
70,991
    
 
144,070
    
 
218,967
    
$
20.08
    
 
5.00
    
$
0
  
                                                         
Granted
    
—
      
28,440
      
—
      
28,440
      
5.04
      
 
      
 
  
Exercised
    
—
      
—
      
—
      
—
      
—
      
 
      
 
  
Forfeited
    
—
      
(4,545
)
    
—
      
(4,545
)
    
17.34
      
 
      
 
  
Expired
    
(3,906
)
    
(703
)
    
(10,979
)
    
(15,588
)
    
29.17
      
 
      
 
  
Outstanding, as of December 31, 2020
    
—
    
 
94,183
    
 
133,091
    
 
227,274
    
$
17.61
    
 
3.87
    
$
0
  
Vested or expected to vest at December 31, 2020
  
 
 
 
  
 
 
 
  
 
 
 
  
 
209,427
    
$
18.51
    
 
3.68
    
$
0
  
Exercisable at December 31, 2020
  
 
 
 
  
 
 
 
  
 
 
 
  
 
167,980
    
$
20.77
    
 
3.21
    
$
0
  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
 
 
 
 
 
  
Options Outstanding
    
Options Exercisable
  
Range of exercise prices
    
Number of
shares
    
Weighted
average
exercise
price
    
Weighted
average
remaining
life (in years)
    
Number
exercisable
    
Weighted
average
exercise
price
  
$ 3.60
-
5.20
      
28,065
     $
5.01
      
6.67
      
84
     $
4.08
  
$ 5.21
-
15.68
      
49,919
      
12.16
      
4.82
      
23,814
      
13.30
  
$ 15.69
-
39.36
      
149,290
      
21.80
      
3.06
      
144,082
      
22.01
  
$ 3.60
-
39.36
      
227,274
      
 
      
 
      
167,980