| Fiscal years ended | March 25, | March 26, | ||||||
| (in thousands) | 2017 | 2016 | ||||||
| Current | ||||||||
| Federal | $ | — | $ | — | ||||
| State | 2 | 2 | ||||||
| Total Current | 2 | 2 | ||||||
| Deferred | ||||||||
| Federal | (496 | ) | (1,297 | ) | ||||
| State | (6 | ) | 215 | |||||
| Total Deferred | (502 | ) | (1,082 | ) | ||||
| Change in liability for uncertain tax positions | 14 | 13 | ||||||
| Change in valuation allowance | 488 | 1,069 | ||||||
| Provision for income taxes | $ | 2 | $ | 2 | ||||
| Fiscal years ended (In thousands) | March 25, 2017 | March 26, 2016 | ||||||
| Net operating loss carryforwards | $ | 15,984 | $ | 15,065 | ||||
| Income tax credits | 323 | 296 | ||||||
| Inventory reserves and additional costs capitalized | 1,450 | 1,935 | ||||||
| Accrued vacation | 109 | 131 | ||||||
| Deferred rent | — | 44 | ||||||
| Non-qualified stock options and restricted stock | 5 | (10 | ) | |||||
| Other | 146 | 68 | ||||||
| Total deferred tax assets | 18,017 | 17,529 | ||||||
| Valuation allowance | (18,017 | ) | (17,529 | ) | ||||
| Net deferred tax assets | $ | — | $ | — | ||||
| Fiscal years ended (In thousands except percentages) | March 25, 2017 | March 25, 2016 | ||||||||||||||
| Statutory federal income tax (benefit) | $ | (525 | ) | 34.0 | % | $ | (1,395 | ) | 34.0 | % | ||||||
| Valuation allowance | 488 | (31.6 | ) | 1,069 | (26.1 | ) | ||||||||||
| State income tax, net of federal benefit | (90 | ) | 5.8 | (239 | ) | 5.8 | ||||||||||
| Net operating loss expiration | 86 | (5.6 | ) | 451 | (11.0 | ) | ||||||||||
| Non tax-deductible expenses | 77 | (5.0 | ) | 107 | (2.6 | ) | ||||||||||
| Tax credits | (40 | ) | 2.6 | (35 | ) | 0.9 | ||||||||||
| Liability for uncertain tax positions | 14 | (0.9 | ) | 13 | (0.3 | ) | ||||||||||
| Other | (8 | ) | 0.5 | 31 | (0.8 | ) | ||||||||||
| Effective income tax | $ | 2 | (0.2 | )% | $ | 2 | (0.1 | )% | ||||||||
| (In thousands) | Fiscal Year 2017 | Fiscal Year 2016 | ||||||
| Balance as of beginning of year | $ | 106 | $ | 93 | ||||
| Additions based on current year tax positions | 14 | 13 | ||||||
| (Reductions) additions for prior year tax positions | — | — | ||||||
| Balance as of end of year | $ | 120 | $ | 106 | ||||