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Segment Reporting: (Details) | 3 Months Ended | 12 Months Ended
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Dec. 28, 2019 USD ($) | Sep. 28, 2019 USD ($) | Jun. 29, 2019 USD ($) | Mar. 30, 2019 USD ($) | Dec. 29, 2018 USD ($) | Sep. 29, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 28, 2019 USD ($) item | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($)
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of reportable business segments | item |  |  |  |  |  |  |  |  | 2 |  |
Total revenue | $ 17,882,600 | $ 19,680,900 | $ 17,404,200 | $ 18,331,200 | $ 17,071,800 | $ 19,118,500 | $ 18,159,800 | $ 18,161,000 | $ 73,298,900 | $ 72,511,100 | $ 69,757,300
Total operating income | 10,943,000 | $ 12,274,700 | $ 9,846,900 | $ 10,066,500 | 10,179,600 | $ 11,435,300 | $ 10,074,700 | $ 10,074,200 | 43,131,100 | 41,763,800 | 38,805,000
Total depreciation and amortization |  |  |  |  |  |  |  |  | 400,100 | 314,100 | 355,400
Total identifiable assets | 61,842,200 |  |  |  | 46,663,100 |  |  |  | 61,842,200 | 46,663,100 |
Franchising | Canadian operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 4,700,000 | 4,400,000 | 3,800,000
Operating | Franchising |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 57,243,100 | 54,334,600 | 51,287,100
Total operating income |  |  |  |  |  |  |  |  | 35,169,900 | 31,882,200 | 29,513,900
Total depreciation and amortization |  |  |  |  |  |  |  |  | 281,600 | 240,500 | 271,300
Total identifiable assets | 3,736,000 |  |  |  | 5,208,400 |  |  |  | 3,736,000 | 5,208,400 |
Operating | Leasing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 16,055,800 | 18,176,500 | 18,470,200
Total operating income |  |  |  |  |  |  |  |  | 7,961,200 | 9,881,600 | 9,291,100
Total depreciation and amortization |  |  |  |  |  |  |  |  | 118,500 | 73,600 | $ 84,100
Total identifiable assets | 26,596,700 |  |  |  | 40,490,000 |  |  |  | 26,596,700 | 40,490,000 |
Unallocated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets | $ 31,509,500 |  |  |  | $ 964,700 |  |  |  | $ 31,509,500 | $ 964,700 |

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