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Note R - Stock Options (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2017
  
 
52,296
    
 
82,086
    
 
1,343,111
    
 
1,477,493
    
$
2.91
    
 
 
 
  
 
 
 
                                                         
Granted
    
—
      
351,918
      
—
      
351,918
      
1.97
      
 
      
 
  
Exercised
    
—
      
—
      
—
      
—
      
—
      
 
      
 
  
Forfeited
    
—
      
(38,613
)
    
(111,253
)
    
(149,866
)
    
2.63
      
 
      
 
  
Expired
    
(18,961
)
    
(13,473
)
    
(59,097
)
    
(91,531
)
    
3.03
      
 
      
 
  
Outstanding, as of December 31, 2018
  
 
33,335
    
 
381,918
    
 
1,172,761
    
 
1,588,014
    
$
2.72
    
 
5.00
    
$
0
  
                                                         
Granted
    
—
      
241,334
      
—
      
241,334
      
1.17
      
 
      
 
  
Exercised
    
—
      
—
      
—
      
—
      
—
      
 
      
 
  
Forfeited
    
—
      
(40,615
)
    
(4,168
)
    
(44,783
)
    
2.27
      
 
      
 
  
Expired
    
(2,084
)
    
(14,717
)
    
(16,040
)
    
(32,841
)
    
3.08
      
 
      
 
  
Outstanding, as of December 31, 2019
  
 
31,251
    
 
567,920
    
 
1,152,553
    
 
1,751,724
    
$
2.51
    
 
4.30
    
$
0
  
Vested or expected to vest at December 31, 2019
  
 
 
 
  
 
 
 
  
 
 
 
  
 
1,594,905
    
$
2.59
    
 
4.17
    
$
0
  
Exercisable at December 31, 2019
  
 
 
 
  
 
 
 
  
 
 
 
  
 
992,747
    
$
2.88
    
 
3.63
    
$
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
 
$
0.51
-
1.99
 
 
 
418,336
 
 
$
1.52
 
 
 
5.78
 
 
 
62,712
 
 
$
1.96
 
$
2.00
-
3.50
 
 
 
1,164,841
 
 
 
2.56
 
 
 
4.28
      
761,488
      
2.58
 
$
3.51
-
4.92
 
 
 
168,547
 
 
 
4.58
 
 
 
0.76
      
168,547
      
4.58
 
$
0.51
-
4.92
 
 
 
1,751,724
 
 
 
 
 
 
 
 
      
992,747