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Note J - Stock Option Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Number of Options
    
Weighted Averaged Exercise Price $
    
Weighted Average Remaining Contractual Life (Years)
    
Aggregate Intrinsic Options Value $
  
Options outstanding December 31, 2019
    
1,670,221
      
1.71
      
2.40
      
-
  
Granted
    
-
      
-
      
-
      
-
  
Exercised during 2019
    
-
      
-
      
-
      
-
  
Forfeited or expired
    
(457,779
 )    
1.96
      
-
      
-
  
Options outstanding December 31, 2019
    
1,212,442
      
1.61
      
2.00
      
-
  
Granted during 2020
    
1,135,277
      
2.00
      
4.82
      
137,186
  
Exercised during 2020
    
(336,970
 )    
1.14
      
-
      
-
  
Forfeited or expired during 2020
    
(57,306
 )    
3.89
      
-
      
-
  
Options outstanding December 31, 2020
    
1,953,443
      
1.88
      
3.09
      
476,964
  
Exercisable, December 31, 2020
    
1,169,925
      
1.79
      
1.90
      
385,507
  
   
Number of Options
    
Weighted Averaged Exercise Price $
    
Weighted Average Remaining Contractual Life (Years)
    
Aggregate Intrinsic Options Value $
  
Options outstanding December 31, 2019
    
33,332
      
1.87
      
2.94
      
-
  
Granted    
16,666
      
0.55
      
4.43
      
13,999
  
Exercised during 2019
    
-
      
-
      
-
      
-
  
Options outstanding December 31, 2019
    
49,998
      
1.87
      
2.94
      
 
  
Granted during 2020    
33,332
      
1.71
      
4.60
      
13,666
  
Exercised during 2020
    
-
      
-
      
-
      
-
  
Forfeited or expired during 2020
    
(8,333
 )    
2.70
      
-
      
 
  
Options outstanding December 31, 2020    
74,997
      
1.41
      
3.18
      
54,748
  
Exercisable, December 31, 2020    
47,220
      
1.38
      
2.55
      
36,915