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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
May 29, 2016
May 31, 2015
May 25, 2014
Cash flows from operating activities:      
Consolidated net (loss) income $ (11,448,000) $ 13,725,000 $ 19,342,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 9,395,000 7,090,000 7,114,000
Stock-based compensation expense 3,465,000 1,577,000 1,356,000
Deferred taxes (9,787,000) 4,152,000 5,585,000
Change in investment in non-public company , fair value (1,200,000) (3,900,000) (10,000,000)
Tax benefit from stock based compensation (150,000) (463,000) (1,922,000)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 793,000
Net loss (gain) on disposal of property and equipment 46,000 (90,000) 329,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 34,000,000
Changes in assets and liabilities:      
Accounts receivable, net 73,000 (1,754,000) (7,982,000)
Inventories, net (508,000) (292,000) (622,000)
Prepaid expenses and other current assets 965,000 177,000 4,711,000
Accounts payable (4,105,000) 2,894,000 (141,000)
Accrued compensation (1,282,000) 2,646,000 38,000
Other accrued liabilities 2,556,000 11,000 3,211,000
Restricted cash collateral (225,000)
Deferred revenue (11,000) (411,000) 6,000
Net cash provided by operating activities 21,784,000 26,155,000 21,045,000
Cash flows from investing activities:      
Purchases of property and equipment (40,867,000) (17,511,000) (14,886,000)
Deposit on capital lease (850,000)
Investment in non-public company, fair value (18,000,000)
Proceeds from sales of fixed assets 127,000 1,071,000
Purchases of marketable securities (1,417,000)
Proceeds from maturities of marketable securities 2,962,000
Net cash used in investing activities (41,590,000) (34,440,000) (13,341,000)
Cash flows from financing activities:      
Proceeds from sale of common stock 322,000 122,000 2,298,000
Taxes paid by Company for stock swaps and RSUs 0 (343,000) (1,271,000)
Tax benefit from stock-based compensation expense 150,000 463,000 1,922,000
Net change in other assets/liabilities (247,000) (24,000) 31,000
Proceeds from long term debt 26,748,000 15,014,000
Payments on long term debt (14,652,000) (6,867,000) (5,933,000)
Proceeds from lines of credit 26,100,000 30,417,000 9,500,000
Payments on lines of credit (22,600,000) (30,417,000) (13,500,000)
Payments to non-controlling interest. (248,000) (196,000) (226,000)
Net cash provided by (used in) financing activities 15,573,000 8,169,000 (7,179,000)
Net (decrease) increase in cash and cash equivalents (4,233,000) (116,000) 525,000
Cash and cash equivalents at beginning of year 14,127,000 14,243,000 13,718,000
Cash and cash equivalents at end of year 9,894,000 14,127,000 14,243,000
Supplemental disclosure of cash flow information:      
Cash paid during the period for interest 2,017,000 1,994,000 1,504,000
Cash paid during the period for income taxes, net of refunds received 2,625,000 150,000 50,000
Supplemental disclosure of non-cash investing and financing activities:      
Facility and equipment acquired under a capital lease $ 3,908,000