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INCOME TAXES - Sources (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 27, 2019 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Dec. 27, 2019 | Dec. 28, 2018 | Dec. 31, 2017 | Dec. 29, 2017
U.S. federal statutory rate (as a percent) |  |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00% | 34.00%
One-time decrease in deferred tax assets |  |  |  |  |  |  |  |  | $ 1,300 |  |  |  |
Tax Act additional deferred tax expense |  |  |  |  |  |  |  |  |  |  | $ 200 |  |
Sources and tax effects of the differences |  |  |  |  |  |  |  |  |  |  |  |  |
Computed "expected" federal income tax expense |  |  |  |  |  |  |  |  |  | $ 977 | 2,554 |  | $ 4,655
Permanent differences |  |  |  |  |  |  |  |  |  | 163 | 77 |  | (61)
Nondeductible Executive Compensation |  |  |  |  |  |  |  |  |  | 688 |  |  |
Stock options and disqualifying dispositions |  |  |  |  |  |  |  |  |  | (731) | (354) |  | (1,629)
Tax Act - federal rate change |  |  |  |  |  |  |  |  |  |  |  |  | (1,277)
Energy efficient building deduction |  |  |  |  |  |  |  |  |  | (1,291) | (919) |  |
Current and deferred state income tax expense, net of federal benefit |  |  |  |  |  |  |  |  |  | 466 | 815 |  | 287
Change in valuation allowances on deferred tax assets |  |  |  |  |  |  |  |  |  |  |  |  | 15
Federal deferred tax adjustments |  |  |  |  |  |  |  |  |  | 231 | 220 |  | (441)
Adjustment for uncertain tax positions |  |  |  |  |  |  |  |  |  | (282) | 61 |  | 363
Research and development tax credit |  |  |  |  |  |  |  |  |  | (510) | (313) |  | (188)
Adjustment to prior earn-out liability |  |  |  |  |  |  |  |  |  |  | 198 |  |
Non-deductible transaction expenses |  |  |  |  |  |  |  |  |  |  | 203 |  |
Other |  |  |  |  |  |  |  |  |  | 27 | (15) |  | (162)
True up income tax accounts |  |  |  |  |  |  |  |  |  | 77 |  |  |
Total provision for income taxes | $ 1,188 | $ (376) | $ (70) | $ (927) | $ (93) | $ 1,597 | $ 869 | $ (242) |  | $ (185) | $ 2,131 |  | $ 1,562
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 35.00%

X
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