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Stockholders' Equity (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 29, 2020 | Sep. 24, 2019
Schedule Of Stockholders Equity [Line Items] |  |
Preferred stock, shares authorized | 5,000,000 | 5,000,000
Common stock, shares authorized | 50,000,000 | 50,000,000
Common stock, shares outstanding | 12,612,852 | 12,541,082
Common stock, par value | $ 0.001 | $ 0.001
Issuance of common shares and warrants in public offering, shares | 2,413 |
Stock based compensation expense | $ 283,000 | $ 719,000
Stock option exercise |  | $ 3,000
Stock option exercise, shares | 15,646 | 667
Aggregate intrinsic value of outstanding options | $ 5,000 |
Other accrued liabilities | $ 352,000 |
Incentive Stock Option [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Stock options granted, shares |  | 99,832
Incentive Stock Option [Member] | Minimum [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Stock options granted, exercise price |  | $ 4.66
Stock options granted, per-share weighted average fair value |  | 2.68
Incentive Stock Option [Member] | Maximum [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Stock options granted, exercise price |  | 5.00
Stock options granted, per-share weighted average fair value |  | $ 3.16
Restricted Stock [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Restricted stock granted, shares | 60,336 | 79,988
Restricted stock granted, weighted average grant date fair value per share |  | $ 3.95
Vesting period | 3 years | 3 years
Remaining total unrecognized compensation cost related to unvested stock-based arrangements | $ 159,000 |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition | 9 months 18 days |
Restricted Stock [Member] | Transaction One [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Restricted stock granted, shares | 46,336 |
Restricted stock granted, weighted average grant date fair value per share | $ 1.54 |
Restricted Stock [Member] | Transaction Two [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Restricted stock granted, shares | 14,000 |
Restricted stock granted, weighted average grant date fair value per share | $ 1.67 |
Restricted Stock [Member] | Minimum [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Restricted stock granted, weighted average grant date fair value per share | 1.54 |
Restricted Stock [Member] | Maximum [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Restricted stock granted, weighted average grant date fair value per share | $ 1.67 |
Stock Options [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Remaining total unrecognized compensation cost related to unvested stock-based arrangements | $ 194,000 |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition | 1 year 9 months 18 days |
Stock option exercise, shares | 15,646 |
Mr. Hoback [Member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Severance and separation agreement | $ 731,000 |
Mr. Hoback [Member] | Stock compensation cost [member] |  |
Schedule Of Stockholders Equity [Line Items] |  |
Severance and separation agreement | $ 277,000 |

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