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ACQUISITIONS (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
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Sep. 18, 2017 | Apr. 03, 2017 | Sep. 28, 2015 | Feb. 23, 2015 | Dec. 30, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2017 | Sep. 24, 2017 | Jun. 25, 2017 | Mar. 26, 2017 | Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 71,999,881 | $ 77,062,137 | $ 70,945,438 | $ 66,855,470 | $ 75,700,827 | $ 71,281,674 | $ 68,773,862 | $ 56,843,687 | $ 286,862,926 | $ 272,600,050 | $ 253,852,214
Business combination, acquisition related costs | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective tax rate for pro forma adjustments |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% | 59.70% | 38.40%
Zycron, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, effective date of acquisition |  | Apr. 03, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, value, acquisitions |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Hold back |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination of contingent consideration |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, contingent consideration arrangements, period of contingency |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |
Period for true-up of acquired working capital |  |  |  | 120 days |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,100,000 |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |
Smart, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, effective date of acquisition | Sep. 18, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, gross | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination of contingent consideration | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, contingent consideration arrangements, period of contingency | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for true-up of acquired working capital |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000 |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |
Pro Forma |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective tax rate for pro forma adjustments |  |  |  |  |  |  |  |  |  |  |  |  | 36.80% |  |
Revolving Credit Facility | Pro Forma |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, rate on additional borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |
Private Placement | Zycron, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, acquisitions |  | 70,670 |  |  |  |  |  |  |  |  |  |  |  |  |

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