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Note R - Equity (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Warrants Valuation Assumptions [Table Text Block]
   
Year ended
December 31,
 
   
2020
   
2019
 
Weighted average Risk free interest rate
   
0.33
%
   
1.82
%
Weighted average price
  $
9.25
    $
12.00
 
Weighted average exercise period
   
5
     
5
 
Weighted average Volatility of stock price
   
110
%
   
83
%
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Total
Warrants
   
Weighted
average
exercise
price
   
Weighted
average
remaining
life
(in years)
   
Aggregate
intrinsic
value
 
                                 
Outstanding, as of December 31, 2018
   
472,622
     
12.72
     
2.05
     
 
 
                                 
Granted
   
250,000
     
12.00
     
 
     
 
 
Exercised
   
     
     
 
     
 
 
Forfeited
   
     
     
 
     
 
 
Expired
   
(299,063
)
   
12.00
     
 
     
 
 
Outstanding, as of December 31, 2019
   
423,559
     
12.80
     
3.94
     
 
Granted – public offering
   
4,264,313
     
5.20
     
 
     
 
 
Granted – prefunded warrants from the public offering
   
512,500
     
0.08
     
 
     
 
 
Granted – other
   
434,375
     
9.25
     
 
     
 
 
Increase due to trigger of anti-dilution provision feature
   
27,244
     
5.20
     
 
     
 
 
Exercised – public offering
   
(284,538
)
   
5.20
     
 
     
 
 
Exercised – prefunded warranted from the public offering
   
(512,500
)
   
0.08
     
 
     
 
 
Exercised – other
   
(121,500
)
   
12.00
     
 
     
 
 
Forfeited
   
     
     
 
     
 
 
Expired
   
(54,066
)
   
6.86
     
 
     
 
 
Outstanding, as of December 31, 2020
   
4,689,387
     
6.04
     
4.48