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Note 11 - Income Taxes (Details) (USD $)
 12 Months Ended
May 26, 2013
May 27, 2012
May 29, 2011
May 30, 2010
Note 11 - Income Taxes (Details) [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00%      
Increase in Net Income Before Taxes 59.00% 140.00%    
Effective Income Tax Rate, Continuing Operations 30.00% 36.00% 52.00%  
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax $ 874,000      
Deferred Tax Assets, Valuation Allowance 783,000 419,000    
Valuation Allowance, Deferred Tax Asset, Change in Amount 364,000      
Unrecognized Tax Benefits 998,000 766,000 760,000 868,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 807,000      
Federal [Member]
        
Note 11 - Income Taxes (Details) [Line Items]        
Operating Loss Carryforwards 8,800,000      
California [Member]
        
Note 11 - Income Taxes (Details) [Line Items]        
Operating Loss Carryforwards 4,600,000      
Other State [Member]
        
Note 11 - Income Taxes (Details) [Line Items]        
Operating Loss Carryforwards 15,200,000      
Federal [Member]
        
Note 11 - Income Taxes (Details) [Line Items]        
Deferred Tax Assets, Tax Credit Carryforwards, Research 118,000      
Deferred Tax Asset Recorded to Additional Paid in Capital 1,200,000      
California [Member]
        
Note 11 - Income Taxes (Details) [Line Items]        
Deferred Tax Assets, Tax Credit Carryforwards, Research 1,200,000      
Deferred Tax Asset Recorded to Additional Paid in Capital 338,000      
Federal Therapeutic Drug [Member]
        
Note 11 - Income Taxes (Details) [Line Items]        
Deferred Tax Assets, Tax Credit Carryforwards $ 244,000