Represents the minimum interest rate for the credit facility.

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Appraised value of assets pledged to secure a debt instrument.

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Maximum leverage ratio to be maintained under the terms of the credit facility.

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Minimum fixed charge coverage ratio to be maintained under the terms of the credit facility.

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Mortgage loan obligations acquired as of balance sheet date.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of assets pledged to secure a debt instrument.

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Cumulative amount paid into a fund, which is used to retire the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount, after accumulated amortization, of debt discount.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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Represents the number of restaurants.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Note 6 - Long-term Debt and Capital Leases (Details Textual)			3 Months Ended	9 Months Ended
	Dec. 03, 2013 USD ($)	May 14, 2012 USD ($)	Feb. 28, 2017 USD ($)	Feb. 28, 2017 USD ($)	Jan. 31, 2017 USD ($)	May 31, 2016 USD ($)
Number of Restaurants	49
Letters of Credit Outstanding, Amount			$ 11,100,000	$ 11,100,000
Secured Debt			$ 5,135,000	5,135,000		$ 15,745,000
Revolving Credit Facility [Member]
Debt Instrument, Term	4 years
Line of Credit Facility, Current Borrowing Capacity	$ 50,000,000				$ 30,000,000
Line of Credit Facility, Maximum Leverage Ratio			4.65
Line of Credit Facility, Minimum Fixed Charge Coverage Ratio			1.25
Credit Facility Interest Rate, Floor	0.00%
Debt Instrument, Collateral Amount, Appraised Value	$ 101,400,000
Debt Instrument, Collateral Amount			$ 80,000,000	80,000,000
Revolving Credit Facility [Member] \| Minimum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
Revolving Credit Facility [Member] \| Maximum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.75%
Revolving Credit Facility [Member] \| Federal Funds Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	3.50%
Revolving Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Revolving Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Sub-limit for Standby Letters of Credit [Member]
Line of Credit Facility, Current Borrowing Capacity	$ 25,000,000				$ 15,000,000
Rent and Other Line Item [Member]
Interest Payable, Current			4,900,000	4,900,000		1,000,000
Senior Notes [Member]
Debt Instrument, Face Amount		$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage		7.625%
Debt Instrument, Unamortized Discount		$ 3,700,000	1,476,000	1,476,000		$ 1,771,000
Debt Instrument, Term		8 years
Debt Instrument, Cumulative Sinking Fund Payments			0	$ 0
Debt Instrument, Maturity Date				May 15, 2020
Mortgages [Member]
Secured Debt			5,100,000	$ 5,100,000
Mortgages [Member] \| Minimum [Member]
Range of Loan Balances			$ 500,000	$ 500,000
Debt Instrument, Interest Rate, Effective Percentage			7.78%	7.78%
Mortgages [Member] \| Maximum [Member]
Range of Loan Balances			$ 1,000,000	$ 1,000,000
Debt Instrument, Interest Rate, Effective Percentage			10.17%	10.17%