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