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5) Stock-based Compensation: Schedule of stock inventive plan changes (Details) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Common Class A |  |  |  |  |
Shares, Outstanding | 838,589 |  | 880,426 | 741,973 | 741,973
Shares outstanding | $ 4.48 |  | $ 4.35 | $ 4.33 | $ 4.33
Shares Granted | 0 | 0 |  |  |
Shares Exercised | (36,133) | 0 |  |  |
Shares Cancelled | (5,704) | 0 |  |  |
Options Exercisable | 805,902 |  |  | 706,854 |
Options exercisable | $ 4.46 |  |  | $ 4.21 |
Available options for future grant | $ 421,241 | $ 525,682 |  |  |
Weighted average contractual term of options outstanding | 6.05 years | 6.62 years |  |  |
Weighted average contractual term of options exercisable | 6.05 years | 6.50 years |  |  |
Aggregated intrinsic value of options outstanding | $ 867,356 |  |  | $ 941,567 |
Aggregated intrinsic value of options exercisable | $ 862,157 |  |  | $ 941,311 |
Common Class C |  |  |  |  |
Shares, Outstanding | 523,603 |  | 523,603 | 428,669 | 556,298
Shares outstanding | $ 5.24 |  | $ 5.24 | $ 5.59 | $ 4.61
Shares Granted | 0 | 0 |  |  |
Shares Exercised | 0 | (103,402) |  |  |
Shares Cancelled | 0 | (24,227) |  |  |
Options Exercisable | 505,227 |  |  | 407,669 |
Options exercisable | $ 5.26 |  |  | $ 5.50 |
Available options for future grant | $ 165,638 | $ 227,750 |  |  |
Weighted average contractual term of options outstanding | 2.69 years | 2.63 years |  |  |
Weighted average contractual term of options exercisable | 2.45 years | 2.55 years |  |  |
Aggregated intrinsic value of options outstanding | $ 267,943 |  |  | $ 151,012 |
Aggregated intrinsic value of options exercisable | $ 260,592 |  |  | $ 151,012 |

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