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Stockholders' Equity (Narrative) (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 10, 2021 | Dec. 28, 2021 | Sep. 28, 2021 | Sep. 29, 2020 | Aug. 13, 2021
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 |  |  | 12,512,072 | 12,612,852 |
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 | $ 362,000 |
Stock option exercise, shares |  |  | 187,291 |  |
Proceeds from stock option exercises |  |  | $ 440,000 |  |
Aggregate intrinsic value of outstanding options |  |  | 723,000 |  |
Aggregate intrinsic value of exercisable options |  |  | 634,000 |  |
Other accrued liabilities |  |  | $ 169,000 |  |
Maximum number of common stock shares that could be repurchased through Tender Offer |  |  |  |  | 1,413,000
Maximum number of common stock shares that could be repurchased through Tender Offer, purchase price per share |  |  |  |  | $ 4.60
Number of shares repurchased through Tender Offer | 333,241 |  |  |  |
Purchase price of shares repurchased through Tender Offer | $ 4.60 |  |  |  |
Cost of shares repurchased through Tender Offer | $ 1,532,908 |  |  |  |
Common Stock [Member] |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Stock option exercise, shares |  |  | 184,682 | 2,413 |
Restricted Stock [Member] |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Restricted stock granted, shares |  |  |  | 60,336 |
Vesting period |  |  |  | 3 years |
Remaining total unrecognized compensation cost related to unvested stock-based arrangements |  |  | $ 36,000 |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition |  |  | 11 months 12 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 |  |
Stock Options [Member] |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Stock options granted, shares |  |  | 90,000 |  |
Stock options granted, exercise price |  |  | $ 2.33 |  |
Remaining total unrecognized compensation cost related to unvested stock-based arrangements |  |  | $ 98,000 |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition |  |  | 1 year 10 months 24 days |  |
Stock option exercise, shares |  |  | 187,291 | 15,646 |
Chief Executive Officer [Member] | Stock Options [Member] |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Stock options granted, shares |  |  | 90,000 |  |
Stock options granted, exercise price |  |  | $ 2.33 |  |
Stock options granted, per-share weighted average fair value |  |  | $ 1.22 |  |
Chief Executive Officer [Member] | Performance shares [Member] | 2018 Plan [Member] |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Stock options granted, shares |  | 10,000 |  |  |
Stock options granted, per-share weighted average fair value |  | $ 2.77 |  |  |
Directors and Officers [Member] | 2018 Plan [Member] | Common Stock [Member] |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |
Stock options granted, shares |  | 12,948 |  |  |
Stock options granted, per-share weighted average fair value |  | $ 2.78 |  |  |

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