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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Aug. 31, 2014
Aug. 25, 2013
Cash flows from operating activities:    
Consolidated net income $ 2,424,000 $ 4,811,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,513,000 1,842,000
Stock-based compensation expense 398,000 278,000
Net loss on disposal of property and equipment   46,000
Deferred taxes 429,000 2,303,000
Change in investment in non-public company, fair value (200,000) (5,400,000)
Changes in current assets and current liabilities:    
Accounts receivable, net 963,000 3,099,000
Accounts receivable, related party (34,000) 466,000
Income taxes receivable 936,000 161,000
Inventories, net (3,099,000) (476,000)
Issuance of notes and advances receivable (1,656,000)  
Collection of notes and advances receivable 255,000  
Prepaid expenses and other current assets (1,422,000) 40,000
Accounts payable 5,231,000 (2,387,000)
Accounts payable, related party 33,000 (489,000)
Accrued compensation (549,000) (129,000)
Other accrued liabilities (1,084,000) 993,000
Deferred revenue (195,000) (620,000)
Net cash provided by operating activities 3,943,000 4,538,000
Cash flows from investing activities:    
Purchases of property and equipment (4,098,000) (4,345,000)
Investment in non-public company, fair value (11,000,000)  
Purchase of marketable securities   (1,417,000)
Net cash used in investing activities (15,098,000) (4,097,000)
Cash flows from financing activities:    
Proceeds from sale of common stock 3,000 250,000
Taxes paid by Company for stock swaps and RSUs (12,000) (1,210,000)
Proceeds from long-term debt 7,070,000  
Payments on long-term debt (1,411,000) (1,383,000)
Proceeds from lines of credit 11,117,000  
Payments on lines of credit (11,117,000) (2,950,000)
Change in other assets (209,000) 31,000
Net cash provided by (used in) financing activities 5,441,000 (5,262,000)
Net decrease in cash and cash equivalents (5,714,000) (4,821,000)
Cash and cash equivalents at beginning of period 14,243,000 [1] 13,718,000
Cash and cash equivalents at end of period 8,529,000 8,897,000
Marketable Maturities [Member]
    
Cash flows from investing activities:    
Proceeds from maturities of marketable securities   $ 1,665,000
[1] Derived from audited financial statements.