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Consolidated Statements of Cash Flows (USD $)
In Thousands
 3 Months Ended
Aug. 28, 2011
Aug. 29, 2010
Consolidated net income $ 1,953 $ 2,403
Adjustments. to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,355 1,306
Stock-based compensation expense 441 506
Tax benefit from stock-based compensation expense (1,280) (804)
Increase in receivable from Monsanto for guaranteed termination fee (200) (200)
Deferred taxes (299) 375
Change in investment in non-public company (fair market value) (52)  
Changes in current assets and current liabilities:    
Accounts receivable, net 1,293 (982)
Accounts receivable, related party 40 95
Income taxes receivable 1,329 874
Inventories, net 533 (1,963)
Issuance of notes and advances receivable (752) (774)
Collection of notes and advances receivable 5 314
Prepaid expenses and other current assets 195 762
Accounts payable 1,413 3,389
Related party accounts payable 71 162
Accrued compensation (456) 3
Other accrued liabilities 276 104
Deferred revenue (1,507) (1,187)
Net cash provided by operating activities 4,358 4,383
Purchases of property and equipment (1,561) (1,676)
Purchase of marketable securities (18,163) (34,849)
Proceeds from maturities and sales of marketable securities 14,175 14,382
Net cash used in investing activities (5,549) (22,143)
Repurchase of outstanding common stock   (362)
Taxes paid by Company for stock swaps and RSUs (25)  
Tax benefit from stock-based compensation expense 1,280 804
Principal payments on long-term debt (1,000) (615)
Decrease in other assets 43 14
Net cash provided by (used in) financing activities 298 (159)
Net decrease in cash and cash equivalents (893) (17,919)
Cash and cash equivalents at beginning of period 8,135 27,817
Cash and cash equivalents at end of period 7,242 9,898
Income tax expense not payable 1,280 804
Long-term receivable from Monsanto for guaranteed termination fee 200 200
Unrealized loss from interest rate swap $ 34 $ 152