Stockholders' Equity (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Aug. 21, 2013	Sep. 26, 2017	Sep. 27, 2016
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		12,427,280	12,282,625
Common stock, par value		$ 0.001	$ 0.001
Stock based compensation expense		$ 748,000	$ 718,000
Stock option exercise			$ 39,000
Stock option exercise, shares			19,531
Aggregate intrinsic value of outstanding options		168,000
Aggregate intrinsic value of exercisable options		$ 168,000
Common Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Issuance of common shares and warrants in public offering, shares	2,200,000
Stock option exercise, shares			19,531
Two Thousand Eight Equity Incentive Compensation Plan [Member]
Schedule Of Stockholders Equity [Line Items]
Shares authorized to issue under plan		1,500,000
Shares available for future grants		225,195
Incentive Stock Option [Member]
Schedule Of Stockholders Equity [Line Items]
Stock options granted, shares		163,992	72,178
Incentive Stock Option [Member] | Minimum [Member]
Schedule Of Stockholders Equity [Line Items]
Stock options granted, exercise price		$ 3.05
Stock options granted, per-share weighted average fair value		2.17
Incentive Stock Option [Member] | Maximum [Member]
Schedule Of Stockholders Equity [Line Items]
Stock options granted, exercise price		3.45
Stock options granted, per-share weighted average fair value		$ 2.49
Incentive and Non-Statutory Stock Options [Member]
Schedule Of Stockholders Equity [Line Items]
Stock options granted, shares			22,686
Incentive and Non-Statutory Stock Options [Member] | Minimum [Member]
Schedule Of Stockholders Equity [Line Items]
Stock options granted, exercise price			$ 4.04
Stock options granted, per-share weighted average fair value			2.85
Incentive and Non-Statutory Stock Options [Member] | Maximum [Member]
Schedule Of Stockholders Equity [Line Items]
Stock options granted, exercise price			6.23
Stock options granted, per-share weighted average fair value			$ 4.52
Restricted Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Restricted stock granted, shares		103,440	44,755
Restricted stock granted, weighted average grant date fair value per share			$ 4.18
Vesting period		3 years	3 years
Remaining total unrecognized compensation cost related to unvested stock-based arrangements		$ 261,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition		1 year 5 months 12 days
Restricted Stock [Member] | Minimum [Member]
Schedule Of Stockholders Equity [Line Items]
Restricted stock granted, weighted average grant date fair value per share		$ 3.15
Restricted Stock [Member] | Maximum [Member]
Schedule Of Stockholders Equity [Line Items]
Restricted stock granted, weighted average grant date fair value per share		$ 3.20
Stock Options [Member]
Schedule Of Stockholders Equity [Line Items]
Stock options granted, shares		163,992
Stock options granted, exercise price		$ 3.15
Remaining total unrecognized compensation cost related to unvested stock-based arrangements		$ 535,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition		1 year 10 months 17 days
Stock option exercise, shares		0