Note 10 - Share-based Employee Compensation (Tables)

9 Months Ended

Feb. 28, 2017

Notes Tables

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

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)		Aggregate Intrinsic Value
Service-based vesting:
Outstanding at May 31, 2016		2,066		$	7. 89
Granted		1,126			3.46
Cancellations and forfeitures		(40	)		4.53
Expired		(1,403	)		6.62
Outstanding at February 28, 2017		1,749		$	6.13		3.64	$	–
Exercisable at February 28, 2017		910		$	8.62		1.10	$	–

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Shares			Weighted Average Fair Value
Service-Based Vesting:
Unvested at May 31, 2016		564		$	6. 29
Granted		538			3.22
Vested		(535	)		5.79
Cancellations and forfeitures		(41	)		5.70
Unvested at  February 28, 2017		526		$	3.71
Performance-Based Vesting:
Unvested at May 31, 2016		225		$	6.51
Cancellations and forfeitures		(84	)		6.51
Unvested at February 28, 2017		141		$	6.51