Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
Mar. 01, 2015	Feb. 23, 2014
Cash flows from operating activities:
Consolidated net income	$ 9,474,000us-gaap_ProfitLoss	$ 14,726,000us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,177,000	5,364,000
Stock-based compensation expense	1,139,000us-gaap_ShareBasedCompensation	992,000us-gaap_ShareBasedCompensation
Tax benefit from stock-based compensation expense	(277,000)	(1,909,000)
Impairment of non-public company, non-fair value investment	793,000
Net (gain) loss on disposal of property and equipment	(53,000)us-gaap_GainLossOnDispositionOfAssets	330,000us-gaap_GainLossOnDispositionOfAssets
Deferred taxes	4,313,000us-gaap_DeferredIncomeTaxExpenseBenefit	5,286,000us-gaap_DeferredIncomeTaxExpenseBenefit
Change in investment in non-public company, fair value	(3,500,000)	(8,100,000)
Changes in current assets and current liabilities:
Accounts receivable, net	(854,000)us-gaap_IncreaseDecreaseInReceivables	(4,969,000)us-gaap_IncreaseDecreaseInReceivables
Accounts receivable, related party	269,000	482,000
Income taxes receivable	1,000,000	2,798,000
Inventories, net	73,000us-gaap_IncreaseDecreaseInInventories	(1,555,000)us-gaap_IncreaseDecreaseInInventories
Issuance of notes and advances receivable	(4,742,000)
Collection of notes and advances receivable	4,727,000
Prepaid expenses and other current assets	(441,000)	(203,000)
Accounts payable	(3,815,000)	(1,845,000)
Accounts payable, related party	12,000	(677,000)
Accrued compensation	648,000	147,000
Other accrued liabilities	(415,000)	2,541,000
Deferred revenue	(152,000)	426,000
Net cash provided by operating activities	13,376,000	13,834,000
Cash flows from investing activities:
Purchases of property and equipment	(10,202,000)	(10,192,000)
Investment in non-public company, fair value	(18,000,000)us-gaap_PaymentsToAcquireInvestments
Purchase of marketable securities		(1,417,000)
Proceeds from sale of fixed assets	922,000
Net cash used in investing activities	(27,280,000)	(8,647,000)
Cash flows from financing activities:
Proceeds from sale of common stock	122,000	2,147,000
Taxes paid by Company for stock swaps and RSUs	(12,000)	(1,252,000)
Tax benefit from stock-based compensation expense	277,000	1,909,000
Proceeds from long-term debt	11,194,000
Payments on long-term debt	(5,074,000)us-gaap_RepaymentsOfLongTermDebt	(4,525,000)us-gaap_RepaymentsOfLongTermDebt
Proceeds from lines of credit	30,417,000us-gaap_ProceedsFromLinesOfCredit	3,500,000us-gaap_ProceedsFromLinesOfCredit
Payments on lines of credit	(21,117,000)us-gaap_RepaymentsOfLinesOfCredit	(7,500,000)us-gaap_RepaymentsOfLinesOfCredit
Change in other assets	(255,000)	29,000
Distributions to non-controlling interest	(196,000)us-gaap_PaymentsToMinorityShareholders	(226,000)us-gaap_PaymentsToMinorityShareholders
Net cash provided by (used in) financing activities	15,356,000	(5,918,000)
Net decrease in cash and cash equivalents	1,452,000	(731,000)
Cash and cash equivalents at beginning of period	14,243,000	13,718,000
Cash and cash equivalents at end of period	15,695,000	12,987,000
Marketable Maturities [Member]
Cash flows from investing activities:
Proceeds from maturities of marketable securities		$ 2,962,000

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.