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Note 8. Stock Options and Restricted Stock Units (Tables)
12 Months Ended
Dec. 31, 2014
Notes to Financial Statements  
Summary of stock options issued
    Number of Options Outstanding     Range of Exercise Price     Weighted Average Exercise Price     Aggregate Intrinsic Value  
Balance at December 31, 2012     220,596     $ 0.01 - $3.33     $ 2.09     $ 257,835  
    Options granted     140,000     $ 7.76 - $8.25     $ 7.90       -  
    Options exercised     (74,360 )   $ 0.01 - $3.33     $ 2.14       405,738  
    Options forfeited     (5,400 )   $ 0.01 - $3.33     $ 1.39       15,256  
Balance at December 31, 2013     280,836     $ 0.01 - $8.25     $ 4.97       1,340,684  
    Options granted     54,000     $ 9.26 - $13.49     $ 12.39       -  
    Options exercised     (76,665 )   $ 0.01 - $7.76     $ 2.23       646,266  
Balance at December 31, 2014     258,171     $ 0.01 - $13.49     $ 7.32       608,570  
Schedule Of Stock Options
      Options Outstanding   Options Exercisable  
Exercise Price     Number     Weighted Average Exercise Price    

Weighted Average Remaining Contractual Life

(in Years)

    Number  
$ 0.01 - $1.00       19,700     $ 0.01       7.05       19,700  
$ 1.01 - $2.00       4,550     $ 1.70       6.40       4,550  
$ 2.01 - $3.00       27,171     $ 2.57       3.90       12,171  
$ 3.01 - $4.00       14,000     $ 3.33       7.25       14,000  
$ 4.01 - $8.00       98,750     $ 7.76       6.31       30,001  
$ 8.00 - $9.00       40,000     $ 8.25       3.64       15,000  
$ 9.01 - $10.00       14,000     $ 9.26       9.99       -  
$ 10.01-$13.49       40,000     $ 13.49       4.19       7,500  
Total       258,171     $ 7.32       5.62       102,922  
Schedule of Stock Options, Valuation Assumptions
   

Year ended

 December 31,

2014

   

Year ended

 December 31,

2013

 
Expected dividend yield     0.33 %     1.16 %
Expected stock price volatility     161 %     125 %
Weighted-average risk-free interest rate     1.32 %     1.77 %
Weighted-average expected life of options (in years)     4.5       6.0