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Note 10 - Stockholders’ Equity (Tables)
3 Months Ended
Mar. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Following is a summary of the warrant activity for the three months ended March 31, 2018:

 
 
Number of
Warrants
   
Average
Exercise
Price
   
Weighted
Average
Remaining
Contractual
Term in Years
 
 
                 
Outstanding at January 1, 2018
   
858,334
   
$
2.71
     
2.92
 
Exercisable at January 1, 2018
   
858,334
     
2.71
     
2.92
 
Granted
   
-
     
-
     
-
 
Exercised / surrendered
   
-
     
-
     
-
 
Expired
   
-
     
-
     
-
 
Outstanding at December 31, 2017
   
858,334
   
$
2.71
     
2.67
 
Exercisable at December 31, 2017
   
858,334
   
$
2.71
     
2.67
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
Stock option activity under the Company’s stock-based compensation plans is shown below:

 
 
Number of
Shares
   
Average
Exercise
Price per Share
   
Aggregate Intrinsic
Value(1)
   
Weighted
Average
Remaining
Contractual
Term in Years
 
 
                 
Outstanding at January 1, 2018
   
1,072,000
     
1.37
   
$
1,309,425
     
4.67
 
Exercisable at January 1, 2018
   
532,500
     
1.37
   
$
649,725
     
4.67
 
                                 
Granted
                               
Exercised
   
(15,000
)
   
1.26
              -  
Forfeited
   
-
     
-
              -  
Outstanding at March 31, 2018
   
1,057,500
   
$
1.37
   
$
834,750
   
$
4.44
 
Exercisable at March 31, 2018
   
982,500
   
$
1.35
   
$
796,500
   
$
4.43
 
(1)
The intrinsic value of the stock options at March 31, 2018 is the amount by which the market value of the Company’s common stock of $2.16 as of March 31, 2018 exceeds the exercise price of the option.