Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 26, 2023	Dec. 25, 2022
Allowance for doubtful accounts	$ 38	$ 57
Property and equipment, accumulated depreciation	$ 211,809	$ 205,849
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	32,120,035	32,010,919
Common stock, shares outstanding (in shares)	32,120,035	32,010,919
Treasury stock, shares (in shares)	71,950	71,950
Franchise Rights [Member]
Finite-lived intangible assets, accumulated amortization	$ 11,586	$ 11,025
Lease And Other Intangible Assets [Member]
Finite-lived intangible assets, accumulated amortization	$ 1,354	$ 1,333