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5) Stock-based Compensation: Schedule of stock inventive plan changes (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Class A Common Stock |  |  |  |
Shares, Outstanding | 842,738 | 741,973 | 880,426 | 741,973
Shares outstanding | $ 4.48 | $ 4.33 | $ 4.35 | $ 4.33
Shares Exercised | (31,984) |  |  |
Shares Cancelled | (5,704) |  |  |
Options Exercisable | 777,373 | 671,816 |  |
Options exercisable | $ 4.42 | $ 4.08 |  |
Available options for future grant | $ 421,241 | $ 525,682 |  |
Weighted average contractual term of options outstanding | 6.30 years | 6.87 years |  |
Weighted average contractual term of options exercisable | 6.29 years | 6.61 years |  |
Aggregated intrinsic value of options outstanding | $ 873,372 | $ 1,564,592 |  |
Aggregated intrinsic value of options exercisable | $ 862,976 | $ 1,564,592 |  |
Class C Common Stock |  |  |  |
Shares, Outstanding | 523,603 | 428,669 | 523,603 | 556,298
Shares outstanding | $ 5.24 | $ 5.59 | $ 5.24 | $ 4.61
Shares Exercised |  | (103,402) |  |
Shares Cancelled |  | (24,227) |  |
Options Exercisable | 486,853 | 386,669 |  |
Options exercisable | $ 5.27 | $ 5.40 |  |
Available options for future grant | $ 165,638 | $ 227,750 |  |
Weighted average contractual term of options outstanding | 2.94 years | 2.88 years |  |
Weighted average contractual term of options exercisable | 2.45 years | 2.71 years |  |
Aggregated intrinsic value of options outstanding | $ 267,943 | $ 449,896 |  |
Aggregated intrinsic value of options exercisable | $ 253,243 | $ 449,896 |  |

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