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Note 6 - Debt - Long-term Debt (Details) (Parentheticals) - USD ($)
12 Months Ended
May 29, 2016
May 31, 2015
Real Estate Loan [Member]    
Periodic payment $ 133,060 $ 133,060
Debt Instrument, Interest Rate, Stated Percentage 4.02% 4.02%
Capital Equipment Loan 1 [Member]    
Periodic payment $ 175,356 $ 175,356
Debt Instrument, Interest Rate, Stated Percentage 4.39% 4.39%
Capital Equipment Loan 2 [Member]    
Periodic payment $ 95,120 $ 95,120
Debt Instrument, Interest Rate, Stated Percentage 3.68% 3.68%
Capital Equipment Loan 3 [Member]    
Periodic payment $ 55,828 $ 55,828
Debt Instrument, Interest Rate, Stated Percentage 3.74% 3.74%
Capital Equipment Loan 4 [Member]    
Periodic payment $ 68,274 $ 68,274
Debt Instrument, Interest Rate, Stated Percentage 2.79% 2.79%
Real Estate Loan 2 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 2.25%
Real Estate Loan 2 [Member]    
Periodic payment $ 46,000
Capital Equipment Loan 5 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 2.25%
Capital Equipment Loan 5 [Member]    
Periodic payment $ 122,000
Capital Equipment Loan 6 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument, Interest Rate, Stated Percentage 2.92%
Capital Equipment Loan 6 [Member]    
Periodic payment $ 75,000
Term Note [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 2.00%
Term Note [Member]    
Periodic payment $ 250,000
Industrial Revenue Bonds [Member]    
Debt Instrument, Interest Rate, Stated Percentage 0.59% 0.31%