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Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Nov. 08, 2016 | Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Sep. 28, 2019 | Dec. 28, 2019 | Dec. 29, 2018
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 10,000,000 |  | 10,000,000 |  |  | 10,000,000 |
Common stock, issued shares (in shares) |  |  | 1,993,578 |  | 1,993,578 |  |  | 1,919,048 |
Common stock, outstanding shares (in shares) |  |  | 1,993,578 |  | 1,993,578 |  |  | 1,919,048 |
Stock issued new during period, shares |  |  |  |  |  |  | 223,214 |  |
Stock issued new during period, value |  |  |  |  |  |  | $ 1,000 |  |
Share based compensation |  |  | $ 135 |  | $ 511 |  | $ 188 |  |
Share based compensation amortized period |  |  |  |  | 2021-09 |  |  |  |
Options outstanding |  |  | 78,400 |  | 78,400 |  |  | 44,400 | 100,900
Options granted |  |  |  |  | 34,000 |  |  |  |
Estimated future share-based compensation expense |  |  | $ 39 |  | $ 39 |  |  |  |
Share-based compensation award amortized period |  |  |  |  | 2021-02 |  |  |  |
Warrants outstanding |  |  | 33,363 |  | 33,363 |  |  | 33,363 |
Warrant exercise price |  |  | $ 3.40 |  | $ 3.40 |  |  | $ 3.40 |
Warrant expiration date |  |  |  |  | Nov. 30, 2021 |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Stock options, exercisable |  |  | 52,900 |  | 52,900 |  |  |  |
Weighted average exercise price, exercisable |  |  | $ 11.51 |  | $ 11.51 |  |  |  |
Share-based compensation expense |  |  | $ 41 | $ 60 | $ 72 | $ 120 |  |  |
2016 Plan |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Options expiration date |  |  |  |  | Oct. 28, 2026 |  |  |  |
Options authorized for issuance |  |  | 400,000 |  | 400,000 |  |  |  |
Options outstanding |  |  | 38,000 |  | 38,000 |  |  | 4,000 |
2016 Plan | Employees |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Options granted, vesting period |  |  |  |  | 2 years |  |  |  |
2016 Plan | Non-Employee Directors |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Options granted, vesting period |  |  |  |  | 6 months |  |  |  |
2011 Plan |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Options expiration date |  |  |  |  | May 12, 2021 |  |  |  |
Options outstanding |  |  | 40,400 |  | 40,400 |  |  | 40,400 |
Additional awards to be granted after adoption of 2016 plan |  |  |  |  | 0 |  |  |  |
Energy Efficiency Investments LLC Securities Purchase Agreement | Notes Payable |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance date |  | Nov. 08, 2016 |  |  |  |  |  |  |
Debt interest rate |  | 3.00% |  |  |  |  |  |  |
Energy Efficiency Investments LLC Securities Purchase Agreement | Notes Payable | Maximum |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 7,732 |  |  |  |  |  |  |
Common Stock | Energy Efficiency Investments LLC Securities Purchase Agreement |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Common shares, returned | 122,257 |  |  |  |  |  |  |  |
Contractor |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Stock issued for services, shares |  |  |  |  | 74,530 |  |  |  |
Stock issued for services, value |  |  |  |  | $ 376 |  |  |  |
Articles of Incorporation |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 10,000,000 |  | 10,000,000 |  |  |  |

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