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Note 5 - Stockholders' Equity (Tables)

12 Months Ended

May. 31, 2015

Notes Tables

Schedule of Share-based Compensation, Activity [Table Text Block]

		Restricted Stock Outstanding												Stock Options Outstanding
		RSUs and Options Available for Grant				Number of Restricted Shares				Weighted Average Grant Date Fair Value				Number of Stock Options				Weighted Average Exercise Price
Balance at May 27, 2012			449,643				348,166			$	5.93				2,046,432			$	6.50
Granted			(26,666	)			6,666			$	9.01				20,000			$	9.01
Awarded/Exercised			—				(231,086	)		$	5.74				(671,563	)		$	6.30
Forfeited			—				(28,416	)		$	6.20				(44,977	)		$	6.34
Plan shares expired			—				—				—				(10,000	)		$	13.32
Balance at May 26, 2013			422,977				95,330			$	6.52				1,339,892			$	6.58
Additional shares reserved			2,000,000				—				—				—				—
Granted			(420,131	)			128,631			$	14.30				291,500			$	14.30
Awarded/Exercised			—				(62,499	)		$	6.18				(398,080	)		$	6.45
Forfeited			—				(12,162	)		$	8.86				(12,452	)		$	6.66
Plan shares expired			(2,846	)			—				—				(5,000	)		$	13.32
Balance at May 25, 2014			2,000,000				149,300			$	13.17				1,215,860			$	8.45
Granted			(1,118,857	)			324,357			$	13.97				794,500			$	14.20
Awarded/Exercised			—				(79,219	)		$	11.57				(205,419	)		$	6.55
Forfeited			—				(1,667	)		$	14.30				(2,223	)		$	14.30
Plan shares expired			—				—				—				(66,000	)		$	11.32
Balance at May 31, 2015			881,143				392,771			$	14.15				1,736,718			$	11.19

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

		Options Outstanding																Options Exercisable
Range of Exercise Prices			Number of Shares Outstanding				Weighted Average Remaining Contractual Life (in years)				Weighted Average Exercise Price				Aggregate Intrinsic Value				Number of Shares Exercisable				Weighted Average Exercise Price				Aggregate Intrinsic Value
$ 5.00 - $6.00			317,750				2.10			$	5.65			$	2,746,675				317,750			$	5.65			$	2,746,675
$ 6.01 - $9.00			315,191				1.83			$	6.46			$	2,466,904				315,191			$	6.46			$	2,466,904
$ 9.01 - $14.00			140,000				6.14			$	12.57			$	240,900				30,732			$	10.55			$	115,027
$14.01- $14.39			963,777				6.39			$	14.36			$	—				185,791			$	14.30			$	—
$ 5.00 - $14.39			1,736,718				4.76			$	11.19			$	5,454,479				849,464			$	8.02			$	5,328,606

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]

		Outstanding Options				Weighted Average Exercise Price				Weighted Average Remaining Contract Term (in years)				Aggregate Intrinsic Value
Vested			849,464			$	8.02				2.74			$	5,328,606
Expected to vest			861,612			$	14.22				6.69				123,261
Total			1,711,076			$	11.14				4.73			$	5,451,867