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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	May 27, 2018	Feb. 25, 2018	Nov. 26, 2017	Aug. 27, 2017	May 28, 2017	Feb. 26, 2017	Nov. 27, 2016	Aug. 28, 2016	May 27, 2018	May 28, 2017	May 29, 2016
Numerator:
Net income (loss) applicable to Common Stockholders	$ 6,108	$ 16,088	$ 487	$ 2,146	$ 2,452	$ 3,500	$ 1,326	$ 3,312	$ 24,829	$ 10,590	$ (11,641)
Denominator:
Weighted average shares for basic net income (loss) per share (in shares)									27,535	27,276	27,044
Effect of dilutive securities:
Stock options and restricted stock units (in shares)									380	376
Weighted average shares for diluted net income (loss) per share (in shares)									27,915	27,652	27,044
Diluted net income (loss) per share (in dollars per share)									$ 0.89	$ 0.38	$ (0.43)

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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