Note 16 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Statements of Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Aug. 31, 2012	Feb. 28, 2014	May 31, 2013	Feb. 28, 2013
Condensed Income Statements, Captions [Line Items]
NET SALES	$ 90,979	$ 86,192		$ 287,226		$ 253,402
COST OF SALES (exclusive of amortization shown separately below)	32,359	29,997		103,092		84,264
GROSS MARGIN	58,620	56,195		184,134		169,138
OPERATING EXPENSES:
Research and development	6,738	4,854		22,178		14,276
Acquisition-related items				(4,638)		0
Selling and marketing	14,295	11,056		43,757		36,218
Distribution	5,068	4,588		14,624		13,817
General and administrative	10,310	10,446		29,534		31,375
Amortization of intangibles	13,225	12,407		39,647		37,192
Loss on disposition of fixed assets	150			180		1,175
Total operating expenses	49,786	43,351		145,282		134,053
(LOSS) INCOME FROM OPERATIONS	8,834	12,844		38,852		35,085
NON-OPERATING INCOME (EXPENSE):
Interest income	16	12		28		22
Loss on extinguishment of debt		(2,425)	(6,700)		(5,625)	(9,111)
Interest expense	(21,900)	(21,952)		(66,172)		(68,691)
Other, net	(108)	(143)		(301)		(265)
Total non-operating (expense) income	(21,992)	(24,508)		(66,445)		(78,045)
(LOSS) INCOME BEFORE INCOME TAXES	(13,158)	(11,664)		(27,593)		(42,960)
(BENEFIT) PROVISION FOR INCOME TAXES	(5,803)	(5,751)		(11,691)		(16,013)
NET (LOSS) INCOME BEFORE EARNINGS OF CONSOLIDATED SUBSIDIARIES	(7,355)	(5,913)		(15,902)		(26,947)
NET LOSS	(7,355)	(5,913)		(15,902)		(26,947)
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
NET SALES	(14,865)	(11,836)		(48,698)		(33,477)
COST OF SALES (exclusive of amortization shown separately below)	(14,865)	(11,836)		(48,698)		(33,477)
NON-OPERATING INCOME (EXPENSE):
Interest income	(11)	(23)		(36)		(52)
Interest expense	11	23		36		52
Net (Loss) Income of consolidated subsidiaries	(1,329)	297		(556)		(1,558)
NET LOSS	(1,329)	297		(556)		(1,558)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
NET SALES	57,604	66,455		186,977		192,414
COST OF SALES (exclusive of amortization shown separately below)	19,737	21,797		62,061		61,860
GROSS MARGIN	37,867	44,658		124,916		130,554
OPERATING EXPENSES:
Research and development	3,212	3,539		10,314		9,822
Acquisition-related items				(4,638)
Selling and marketing	5,673	5,575		18,387		19,277
Distribution	2,921	2,843		8,323		8,653
General and administrative	6,943	7,583		17,767		23,213
Amortization of intangibles	11,971	11,770		35,912		35,312
Loss on disposition of fixed assets				30		1,175
Total operating expenses	30,720	31,310		86,095		97,452
(LOSS) INCOME FROM OPERATIONS	7,147	13,348		38,821		33,102
NON-OPERATING INCOME (EXPENSE):
Interest income				1
Loss on extinguishment of debt		(2,425)				(9,111)
Interest expense	(21,900)	(21,970)		(66,182)		(68,726)
Other, net	(186)	(139)		(621)		(319)
Total non-operating (expense) income	(22,086)	(24,534)		(66,802)		(78,156)
(LOSS) INCOME BEFORE INCOME TAXES	(14,939)	(11,186)		(27,981)		(45,054)
(BENEFIT) PROVISION FOR INCOME TAXES	(6,255)	(5,570)		(11,523)		(16,549)
NET (LOSS) INCOME BEFORE EARNINGS OF CONSOLIDATED SUBSIDIARIES	(8,684)	(5,616)		(16,458)		(28,505)
Net (Loss) Income of consolidated subsidiaries	1,329	(297)		556		1,558
NET LOSS	(7,355)	(5,913)		(15,902)		(26,947)
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
NET SALES	12,252	1,450		40,006		4,353
COST OF SALES (exclusive of amortization shown separately below)	6,402	1,046		22,696		2,997
GROSS MARGIN	5,850	404		17,310		1,356
OPERATING EXPENSES:
Research and development	3,397	1,315		11,654		4,419
Selling and marketing	2,311	458		6,847		1,396
Distribution	345	57		1,099		144
General and administrative	1,647	444		5,547		1,319
Amortization of intangibles	658	54		1,992		163
Loss on disposition of fixed assets	150			150
Total operating expenses	8,508	2,328		27,289		7,441
(LOSS) INCOME FROM OPERATIONS	(2,658)	(1,924)		(9,979)		(6,085)
NON-OPERATING INCOME (EXPENSE):
Interest income	6			8
Other, net	24			97
Total non-operating (expense) income	30			105
(LOSS) INCOME BEFORE INCOME TAXES	(2,628)	(1,924)		(9,874)		(6,085)
(BENEFIT) PROVISION FOR INCOME TAXES	(952)	(695)		(3,406)		(2,260)
NET (LOSS) INCOME BEFORE EARNINGS OF CONSOLIDATED SUBSIDIARIES	(1,676)	(1,229)		(6,468)		(3,825)
NET LOSS	(1,676)	(1,229)		(6,468)		(3,825)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
NET SALES	35,988	30,123		108,941		90,112
COST OF SALES (exclusive of amortization shown separately below)	21,085	18,990		67,033		52,884
GROSS MARGIN	14,903	11,133		41,908		37,228
OPERATING EXPENSES:
Research and development	129			210		35
Selling and marketing	6,311	5,023		18,523		15,545
Distribution	1,802	1,688		5,202		5,020
General and administrative	1,720	2,419		6,220		6,843
Amortization of intangibles	596	583		1,743		1,717
Total operating expenses	10,558	9,713		31,898		29,160
(LOSS) INCOME FROM OPERATIONS	4,345	1,420		10,010		8,068
NON-OPERATING INCOME (EXPENSE):
Interest income	21	35		55		74
Interest expense	(11)	(5)		(26)		(17)
Other, net	54	(4)		223		54
Total non-operating (expense) income	64	26		252		111
(LOSS) INCOME BEFORE INCOME TAXES	4,409	1,446		10,262		8,179
(BENEFIT) PROVISION FOR INCOME TAXES	1,404	514		3,238		2,796
NET (LOSS) INCOME BEFORE EARNINGS OF CONSOLIDATED SUBSIDIARIES	3,005	932		7,024		5,383
NET LOSS	$ 3,005	$ 932		$ 7,024		$ 5,383