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