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Note 12 - Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
Accumulated
    
 
 
 
   
 
 
 
  
 
 
 
  
Additional
    
Retained
    
other
    
Total
  
   
Common stock
    
paid in
    
earnings
    
comprehensive
    
stockholders'
  
   
Number
    
Amount
    
capital
    
(deficit)
    
income (loss)
    
equity
  
                                                 
Balances, December 31, 2016
    
10,461,574
     $
14,460,500
     $
2,857,921
     $
20,399,511
     $
99,154
     $
37,817,086
  
Exercise of stock options
    
68,876
      
322,656
      
(302,787
 )    
-
      
-
      
19,869
  
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration
    
(26,298
 )    
-
      
(712,234
 )    
-
      
-
      
(712,234
 )
Income tax effect related to stock options exercised
    
-
      
-
      
-
      
-
      
-
      
-
  
Stock-based compensation (note 14)
    
-
      
-
      
317,820
      
-
      
-
      
317,820
  
Net income
    
-
      
-
      
-
      
2,446,491
      
-
      
2,446,491
  
Accretion of redeemable non-controlling interest in TingÂ
Virginia, LLC.
    
-
      
-
      
-
      
(12,499
 )    
-
      
(12,499
 )
Other comprehensive income (loss)
    
-
      
-
      
-
      
-
      
105,609
      
105,609
  
Balances, March 31, 2017
    
10,504,152
     $
14,783,156
     $
2,160,720
     $
22,833,503
     $
204,763
     $
39,982,142