CONDENSED CONSOLIDATED STATEMENTS of CHANGES in STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Treasury Stock, at cost
Beginning balance (shares) at Sep. 30, 2018	10,338,548	10,248,905
Beginning Balance at Sep. 30, 2018	$ 25,376	$ 102	$ 47,326	$ (20,463)	$ (1,589)
Net income	1,072			1,072
Stock-based compensation	146		146
Restricted stock vested, net of shares withheld for payment of taxes (shares)		4,439
Restricted stock vested, net of shares withheld for payment of taxes	0	$ 0	0
Exercise of stock options, net of shares surrendered (shares)		2,553
Exercise of stock options, net of shares surrendered	0
Employee stock plan purchases (shares)		5,674
Exercise of stock options, net of shares surrendered	20		20
Ending Balance at Dec. 28, 2018	$ 27,055	$ 102	47,492	(18,950)	(1,589)
Ending balance (shares) at Dec. 28, 2018		10,261,571
Beginning balance (shares) at Sep. 30, 2018	10,338,548	10,248,905
Beginning Balance at Sep. 30, 2018	$ 25,376	$ 102	47,326	(20,463)	(1,589)
Net income	$ 2,953
Exercise of stock options, net of shares surrendered (shares)	34,000
Ending Balance at Jun. 28, 2019	$ 29,269	$ 103	47,824	(17,069)	(1,589)
Ending balance (shares) at Jun. 28, 2019		10,332,486
Beginning balance (shares) at Dec. 28, 2018		10,261,571
Beginning Balance at Dec. 28, 2018	27,055	$ 102	47,492	(18,950)	(1,589)
Net income	670			670
Stock-based compensation	152		152
Restricted stock vested, net of shares withheld for payment of taxes (shares)		38,636
Restricted stock vested, net of shares withheld for payment of taxes	1	$ 1
Exercise of stock options, net of shares surrendered (shares)		11,654
Exercise of stock options, net of shares surrendered	51		51
Ending Balance at Mar. 29, 2019	27,929	$ 103	47,695	(18,280)	(1,589)
Ending balance (shares) at Mar. 29, 2019		10,311,861
Net income	1,211			1,211
Stock-based compensation	117		117
Restricted stock vested, net of shares withheld for payment of taxes (shares)		2,458
Restricted stock vested, net of shares withheld for payment of taxes	(14)	$ 0	(14)
Restricted stock units vested, net of shares withheld for payment of taxes (shares)		5,277
Restricted stock units vested, net of shares withheld for payment of taxes	(34)		(34)
Exercise of stock options, net of shares surrendered (shares)		7,500
Exercise of stock options, net of shares surrendered	27		27
Employee stock plan purchases (shares)		5,390
Exercise of stock options, net of shares surrendered	33		33
Ending Balance at Jun. 28, 2019	29,269	$ 103	47,824	(17,069)	(1,589)
Ending balance (shares) at Jun. 28, 2019		10,332,486
Beginning balance (shares) at Sep. 30, 2019		10,338,548
Beginning Balance at Sep. 30, 2019	31,240	$ 103	48,001	(15,275)	(1,589)
Net income	1,189			1,189
Stock-based compensation	152		152
Restricted stock vested, net of shares withheld for payment of taxes (shares)		6,367
Restricted stock vested, net of shares withheld for payment of taxes	(24)		(24)
Exercise of stock options, net of shares surrendered (shares)		24,000
Exercise of stock options, net of shares surrendered	130		130
Employee stock plan purchases (shares)		6,449
Exercise of stock options, net of shares surrendered	40		40
Ending Balance at Dec. 27, 2019	32,727	$ 103	48,299	(14,086)	(1,589)
Ending balance (shares) at Dec. 27, 2019		10,375,364
Beginning balance (shares) at Sep. 30, 2019		10,338,548
Beginning Balance at Sep. 30, 2019	31,240	$ 103	48,001	(15,275)	(1,589)
Net income	$ 4,826
Exercise of stock options, net of shares surrendered (shares)	30,500
Ending Balance at Jun. 26, 2020	$ 36,742	$ 104	48,676	(10,449)	(1,589)
Ending balance (shares) at Jun. 26, 2020	10,430,726	10,430,726
Beginning balance (shares) at Dec. 27, 2019		10,375,364
Beginning Balance at Dec. 27, 2019	$ 32,727	$ 103	48,299	(14,086)	(1,589)
Net income	1,523			1,523
Stock-based compensation	185		185
Restricted stock vested, net of shares withheld for payment of taxes (shares)		4,663
Restricted stock vested, net of shares withheld for payment of taxes	(33)		(33)
Restricted stock units vested, net of shares withheld for payment of taxes (shares)		10,089
Restricted stock units vested, net of shares withheld for payment of taxes	(35)		(35)
Exercise of stock options, net of shares surrendered (shares)		2,000
Exercise of stock options, net of shares surrendered	8		8
Ending Balance at Mar. 27, 2020	34,375	$ 103	48,424	(12,563)	(1,589)
Ending balance (shares) at Mar. 27, 2020		10,392,116
Net income	2,114			2,114
Stock-based compensation	189		189
Restricted stock vested, net of shares withheld for payment of taxes (shares)		25,576
Restricted stock vested, net of shares withheld for payment of taxes	(6)		(6)
Exercise of stock options, net of shares surrendered (shares)		4,500
Exercise of stock options, net of shares surrendered	23		23
Employee stock plan purchases (shares)		8,534
Exercise of stock options, net of shares surrendered	47	$ 1	46
Ending Balance at Jun. 26, 2020	$ 36,742	$ 104	$ 48,676	$ (10,449)	$ (1,589)
Ending balance (shares) at Jun. 26, 2020	10,430,726	10,430,726