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, 2017		10,197,078
Beginning Balance at Sep. 30, 2017	$ 14,429	$ 102	$ 46,789	$ (30,873)	$ (1,589)
Net income	(494)
Employee stock plan purchases	69		69
Restricted stock vested, net of shares withheld for payment of taxes (shares)					3,498
Restricted stock vested, net of shares withheld for payment of taxes	0	0	$ 0
Employee stock plan purchases (shares)			5,483
Employee stock plan purchases	24		$ 24
Ending Balance at Dec. 29, 2017	14,028	$ 102	46,882	(31,367)	$ (1,589)
Ending balance (shares) at Dec. 29, 2017		10,206,059
Beginning balance (shares) at Sep. 30, 2017		10,197,078
Beginning Balance at Sep. 30, 2017	14,429	$ 102	46,789	(30,873)	(1,589)
Net income	1,289
Net income	$ 1,289
Exercise of stock options, net of shares surrendered (shares)	1,400
Ending Balance at Jun. 29, 2018	$ 16,115	$ 102	47,186	(29,584)	(1,589)
Ending balance (shares) at Jun. 29, 2018		10,248,083
Beginning balance (shares) at Dec. 29, 2017		10,206,059
Beginning Balance at Dec. 29, 2017	14,028	$ 102	46,882	(31,367)	$ (1,589)
Net income	1,579
Employee stock plan purchases	129		129
Restricted stock vested, net of shares withheld for payment of taxes (shares)					30,530
Restricted stock vested, net of shares withheld for payment of taxes	0		0
Ending Balance at Mar. 30, 2018	15,736	$ 102	47,011	(29,788)	$ (1,589)
Ending balance (shares) at Mar. 30, 2018		10,236,589
Net income	204
Net income	204
Employee stock plan purchases	$ 149		$ 149
Restricted stock vested, net of shares withheld for payment of taxes (shares)					3,529
Exercise of stock options, net of shares surrendered (shares)	1,400
Employee stock plan purchases (shares)			6,565
Employee stock plan purchases	$ 26		$ 26
Ending Balance at Jun. 29, 2018	$ 16,115	$ 102	47,186	(29,584)	$ (1,589)
Ending balance (shares) at Jun. 29, 2018		10,248,083
Beginning balance (shares) at Sep. 30, 2018	10,248,905	10,248,905
Beginning Balance at Sep. 30, 2018	$ 25,376	$ 102	47,326	(20,463)	(1,589)
Net income	1,072			1,072
Employee stock plan purchases	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
Employee stock plan purchases	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	10,248,905	10,248,905
Beginning Balance at Sep. 30, 2018	$ 25,376	$ 102	47,326	(20,463)	(1,589)
Net income	2,953
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	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
Employee stock plan purchases	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
Net income	1,211
Employee stock plan purchases	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)		(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
Employee stock plan purchases	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	10,332,486