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4) Stock-based Compensation: Schedule of stock inventive plan changes (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Class A Common Stock |  |  |  |
Shares, Outstanding | 741,973 | 589,801 | 741,973 | 618,261
Shares outstanding | $ 4.33 | $ 3.97 | $ 4.33 | $ 3.89
Shares Exercised |  | (28,460) |  |
Per Share Shares Exercised |  | $ 2.15 |  |
Options Exercisable | 636,764 | 484,659 |  |
Options exercisable | $ 3.94 | $ 3.45 |  |
Available options for future grant | $ 253,432 | $ 454,842 |  |
Weighted average contractual term of options outstanding | 7.12 years | 7.50 years |  |
Weighted average contractual term of options exercisable | 6.70 years | 7.03 years |  |
Aggregated intrinsic value of options outstanding | $ 1,837,828 | $ 844,342 |  |
Aggregated intrinsic value of options exercisable | $ 1,824,086 | $ 844,342 |  |
Class C Common Stock |  |  |  |
Shares, Outstanding | 556,298 | 577,436 | 556,298 | 577,436
Shares outstanding | $ 4.61 | $ 3.54 | $ 4.61 | $ 3.54
Options Exercisable | 493,298 | 498,686 |  |
Options exercisable | $ 4.26 | $ 2.99 |  |
Available options for future grant |  | $ 57,750 |  |
Weighted average contractual term of options outstanding | 2.42 years | 2.50 years |  |
Weighted average contractual term of options exercisable | 2.13 years | 2.16 years |  |
Aggregated intrinsic value of options outstanding | $ 1,264,540 | $ 1,096,391 |  |
Aggregated intrinsic value of options exercisable | $ 1,264,540 | $ 1,096,391 |  |

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