Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Nov. 30, 2014	Nov. 24, 2013
Cash flows from operating activities:
Consolidated net income	$ 5,671,000	$ 8,304,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,343,000	3,787,000
Stock-based compensation expense	748,000	639,000
Tax benefit from stock-based compensation expense	(36,000)	(175,000)
Net loss on disposal of property and equipment		124,000
Deferred taxes	1,415,000	4,050,000
Change in investment in non-public company, fair value	(1,400,000)	(7,700,000)
Changes in current assets and current liabilities:
Accounts receivable, net	(7,715,000)	(5,673,000)
Accounts receivable, related party	142,000	540,000
Income taxes receivable	1,880,000	262,000
Inventories, net	(5,705,000)	(2,752,000)
Issuance of notes and advances receivable	(2,464,000)
Collection of notes and advances receivable	363,000
Prepaid expenses and other current assets	176,000	(1,361,000)
Accounts payable	7,203,000	3,049,000
Accounts payable, related party	198,000	(544,000)
Accrued compensation	877,000	(743,000)
Other accrued liabilities	(303,000)	2,452,000
Deferred revenue	(1,043,000)	34,000
Net cash provided by operating activities	3,350,000	4,293,000
Cash flows from investing activities:
Purchases of property and equipment	(7,135,000)	(7,681,000)
Investment in non-public company, fair value	(18,000,000)
Purchase of marketable securities		(1,417,000)
Net cash used in investing activities	(25,135,000)	(6,136,000)
Cash flows from financing activities:
Proceeds from sale of common stock	100,000	1,253,000
Taxes paid by Company for stock swaps and RSUs	(12,000)	(1,219,000)
Tax benefit from stock-based compensation expense	36,000	175,000
Proceeds from long-term debt	11,194,000
Payments on long-term debt	(3,341,000)	(3,128,000)
Proceeds from lines of credit	25,117,000
Payments on lines of credit	(20,117,000)	(3,000,000)
Change in other assets	(269,000)	36,000
Distributions to non-controlling interest	(196,000)	(226,000)
Net cash provided by (used in) financing activities	12,512,000	(6,109,000)
Net decrease in cash and cash equivalents	(9,273,000)	(7,952,000)
Cash and cash equivalents at beginning of period	14,243,000	13,718,000
Cash and cash equivalents at end of period	4,970,000	5,766,000
Marketable Maturities [Member]
Cash flows from investing activities:
Proceeds from maturities of marketable securities		$ 2,962,000