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6. Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Our income tax expense reconciles to an income tax expense resulting from applying an assumed statutory federal income rate of 34% to income before income taxes as follows ($ in thousands):

   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2016
    
2015
    
2016
    
2015
  
Income tax expense at federal statutory rate
  
$
487
    
$
652
    
$
687
    
$
1,082
  
                                 
Increase (decrease) in taxes resulting from:
                                
Domestic production activities deduction
    
(38
)
    
(17
)
    
(58
)
    
(47
)
Research and development credit
    
(32
)
    
-
      
(63
)
    
-
  
Incentive stock options
    
19
      
-
      
35
      
-
  
State taxes, net of federal benefit
    
28
      
22
      
30
      
38
  
Increase in reserve for uncertain tax positions
    
4
      
(51
)
    
10
      
(51
)
Other
    
11
      
(12
)
    
20
      
21
  
Income tax expense per the statement of operations
  
$
479
    
$
594
    
$
661
    
$
1,043