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Note 10 - Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
 
 
 
 
Options Outstanding
   
Options Exercisable
 
Exercise
Prices
   
Number
Outstanding
   
Weighted
Average
Remaining
Contractual
Life (years)
   
Weighted
Average
Exercise
Price
   
Number
Exercisable
   
Weighted
Average
Exercise
Price
 
                                             
$
2.96
     
25,000
     
0.62
    $
2.96
     
25,000
    $
2.96
 
Total
     
25,000
     
0.62
    $
2.96
     
25,000
    $
2.96
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
   
December 31, 2019
 
   
Shares
   
Weighted
Average
Exercise
Price
   
Average
Remaining
Life
   
Weighted
Average
Intrinsic
Value
 
                                 
Outstanding at beginning of period
   
70,000
    $
2.96
     
1.62
    $
-
 
Granted
   
-
     
-
     
-
     
-
 
Exercised
   
(45,000
)
   
-
     
-
     
-
 
Forfeited
   
-
     
-
     
-
     
-
 
Expired
   
-
     
-
     
-
     
-
 
Outstanding at end of period
   
25,000
    $
2.96
     
0.62
    $
-
 
Vested and expected to vest
   
25,000
    $
2.96
     
0.62
    $
-
 
Exercisable end of period
   
25,000
    $
2.96
     
0.62
    $
-