Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Aug. 26, 2017	Aug. 27, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 678	$ 269
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	217	218
Deferred tax expense	6	165
Changes in certain current assets and liabilities
Accounts receivable	190	558
Inventories	1,003	(429)
Prepaid expense and other current assets	(108)	(16)
Prepaid income taxes	87	(284)
Deferred revenue	(859)	(1,292)
Accounts payable	(154)	392
Accrued compensation	56	(164)
Other accrued liabilities	(55)	(105)
Income taxes payable	0	(47)
Net cash provided by (used in) operating activities	1,061	(735)
CASH FLOWS FROM INVESTING ACTIVITIES:
Sale of short term investments	4,036	4,014
Purchase of short term investments	(4,047)	(4,021)
Additions to property, plant and equipment	(407)	(203)
Net cash used in investing activities	(418)	(210)
CASH FLOWS FROM FINANCING ACTIVITIES
Cash dividend	(258)	(258)
Net cash used in financing activities	(258)	(258)
Net change in cash and cash equivalents	385	(1,203)
Cash and cash equivalents at beginning of period	10,012	12,651
Cash and cash equivalents at end of period	10,397	11,448
Supplemental Cash Flow Disclosure:
Cash paid for income taxes	$ 17	$ 350