Note 17 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Consolidating Statements of Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Condensed Income Statements, Captions [Line Items]
NET SALES	$ 95,605us-gaap_SalesRevenueNet	$ 90,979us-gaap_SalesRevenueNet	$ 294,323us-gaap_SalesRevenueNet	$ 287,226us-gaap_SalesRevenueNet
COST OF SALES (exclusive of amortization shown separately below)	33,971	32,359	106,571	103,092
GROSS MARGIN	61,634us-gaap_GrossProfit	58,620us-gaap_GrossProfit	187,752us-gaap_GrossProfit	184,134us-gaap_GrossProfit
OPERATING EXPENSES:
Research and development	7,280us-gaap_ResearchAndDevelopmentExpense	6,738us-gaap_ResearchAndDevelopmentExpense	21,474us-gaap_ResearchAndDevelopmentExpense	22,178us-gaap_ResearchAndDevelopmentExpense
Selling and marketing	13,513us-gaap_SellingAndMarketingExpense	14,295us-gaap_SellingAndMarketingExpense	43,942us-gaap_SellingAndMarketingExpense	43,757us-gaap_SellingAndMarketingExpense
Distribution	4,986	5,068	15,342	14,624
General and administrative	9,362us-gaap_GeneralAndAdministrativeExpense	10,310us-gaap_GeneralAndAdministrativeExpense	30,943us-gaap_GeneralAndAdministrativeExpense	29,534us-gaap_GeneralAndAdministrativeExpense
Amortization expense	13,615us-gaap_AdjustmentForAmortization	13,225us-gaap_AdjustmentForAmortization	40,948us-gaap_AdjustmentForAmortization	39,647us-gaap_AdjustmentForAmortization
Total operating expenses	48,756us-gaap_OperatingExpenses	49,786us-gaap_OperatingExpenses	152,649us-gaap_OperatingExpenses	145,282us-gaap_OperatingExpenses
Acquisition-related items				(4,638)us-gaap_OtherOperatingIncome
Impairment loss		150us-gaap_AssetImpairmentCharges		180us-gaap_AssetImpairmentCharges
INCOME (LOSS) FROM OPERATIONS	12,878us-gaap_OperatingIncomeLoss	8,834us-gaap_OperatingIncomeLoss	35,103us-gaap_OperatingIncomeLoss	38,852us-gaap_OperatingIncomeLoss
NON-OPERATING (EXPENSE) INCOME:
Interest income	42us-gaap_InvestmentIncomeInterest	16us-gaap_InvestmentIncomeInterest	131us-gaap_InvestmentIncomeInterest	28us-gaap_InvestmentIncomeInterest
Interest expense	(21,793)us-gaap_InterestExpense	(21,900)us-gaap_InterestExpense	(66,913)us-gaap_InterestExpense	(66,172)us-gaap_InterestExpense
Other, net	177us-gaap_OtherNonoperatingIncomeExpense	(108)us-gaap_OtherNonoperatingIncomeExpense	465us-gaap_OtherNonoperatingIncomeExpense	(301)us-gaap_OtherNonoperatingIncomeExpense
Total non-operating (expense) income	(21,574)us-gaap_NonoperatingIncomeExpense	(21,992)us-gaap_NonoperatingIncomeExpense	(66,317)us-gaap_NonoperatingIncomeExpense	(66,445)us-gaap_NonoperatingIncomeExpense
(LOSS) INCOME BEFORE INCOME TAXES	(8,696)	(13,158)	(31,214)	(27,593)
(BENEFIT) PROVISION FOR INCOME TAXES	30,744us-gaap_IncomeTaxExpenseBenefit	(5,803)us-gaap_IncomeTaxExpenseBenefit	22,783us-gaap_IncomeTaxExpenseBenefit	(11,691)us-gaap_IncomeTaxExpenseBenefit
NET (LOSS) INCOME BEFORE EARNINGS OF CONSOLIDATED SUBSIDIARIES	(39,440)us-gaap_NetIncomeLoss	(7,355)us-gaap_NetIncomeLoss	(53,997)us-gaap_NetIncomeLoss	(15,902)us-gaap_NetIncomeLoss
NET (LOSS) INCOME	(39,440)us-gaap_ProfitLoss	(7,355)us-gaap_ProfitLoss	(53,997)us-gaap_ProfitLoss	(15,902)us-gaap_ProfitLoss
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
NET SALES	(18,542)	(14,865)	(55,151)	(48,698)
COST OF SALES (exclusive of amortization shown separately below)	(18,542)	(14,865)	(55,151)	(48,698)
NON-OPERATING (EXPENSE) INCOME:
Interest income	(25)	(11)	(77)	(36)
Interest expense	25	11	77	36
Net Income (Loss) of consolidated subsidiaries	933	(1,329)	2,270	(556)
NET (LOSS) INCOME	933	(1,329)	2,270	(556)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
NET SALES	63,013	57,604	190,662	186,977
COST OF SALES (exclusive of amortization shown separately below)	18,743	19,737	59,702	62,061
GROSS MARGIN	44,270	37,867	130,960	124,916
OPERATING EXPENSES:
Research and development	3,087	3,212	8,484	10,314
Selling and marketing	5,973	5,673	18,807	18,387
Distribution	2,772	2,921	8,167	8,323
General and administrative	6,056	6,943	20,345	17,767
Amortization expense	11,973	11,971	35,915	35,912
Total operating expenses	29,861	30,720	91,718	86,095
Acquisition-related items				(4,638)
Impairment loss				30
INCOME (LOSS) FROM OPERATIONS	14,409	7,147	39,242	38,821
NON-OPERATING (EXPENSE) INCOME:
Interest income	23		41	1
Interest expense	(21,664)	(21,900)	(66,553)	(66,182)
Other, net	173	(186)	587	(621)
Total non-operating (expense) income	(21,468)	(22,086)	(65,925)	(66,802)
(LOSS) INCOME BEFORE INCOME TAXES	(7,059)	(14,939)	(26,683)	(27,981)
(BENEFIT) PROVISION FOR INCOME TAXES	31,448	(6,255)	25,044	(11,523)
NET (LOSS) INCOME BEFORE EARNINGS OF CONSOLIDATED SUBSIDIARIES	(38,507)	(8,684)	(51,727)	(16,458)
Net Income (Loss) of consolidated subsidiaries	(933)	1,329	(2,270)	556
NET (LOSS) INCOME	(39,440)	(7,355)	(53,997)	(15,902)
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
NET SALES	14,119	12,252	42,175	40,006
COST OF SALES (exclusive of amortization shown separately below)	9,410	6,402	27,403	22,696
GROSS MARGIN	4,709	5,850	14,772	17,310
OPERATING EXPENSES:
Research and development	4,019	3,397	12,385	11,654
Selling and marketing	2,431	2,311	7,624	6,847
Distribution	450	345	1,239	1,099
General and administrative	963	1,647	3,231	5,547
Amortization expense	1,079	658	3,232	1,992
Total operating expenses	8,942	8,508	27,711	27,289
Impairment loss		150		150
INCOME (LOSS) FROM OPERATIONS	(4,233)	(2,658)	(12,939)	(9,979)
NON-OPERATING (EXPENSE) INCOME:
Interest income		6		8
Interest expense	(136)		(383)
Other, net	(349)	24	(436)	97
Total non-operating (expense) income	(485)	30	(819)	105
(LOSS) INCOME BEFORE INCOME TAXES	(4,718)	(2,628)	(13,758)	(9,874)
(BENEFIT) PROVISION FOR INCOME TAXES	(1,560)	(952)	(5,035)	(3,406)
NET (LOSS) INCOME BEFORE EARNINGS OF CONSOLIDATED SUBSIDIARIES	(3,158)	(1,676)	(8,723)	(6,468)
NET (LOSS) INCOME	(3,158)	(1,676)	(8,723)	(6,468)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
NET SALES	37,015	35,988	116,637	108,941
COST OF SALES (exclusive of amortization shown separately below)	24,360	21,085	74,617	67,033
GROSS MARGIN	12,655	14,903	42,020	41,908
OPERATING EXPENSES:
Research and development	174	129	605	210
Selling and marketing	5,109	6,311	17,511	18,523
Distribution	1,764	1,802	5,936	5,202
General and administrative	2,343	1,720	7,367	6,220
Amortization expense	563	596	1,801	1,743
Total operating expenses	9,953	10,558	33,220	31,898
INCOME (LOSS) FROM OPERATIONS	2,702	4,345	8,800	10,010
NON-OPERATING (EXPENSE) INCOME:
Interest income	44	21	167	55
Interest expense	(18)	(11)	(54)	(26)
Other, net	353	54	314	223
Total non-operating (expense) income	379	64	427	252
(LOSS) INCOME BEFORE INCOME TAXES	3,081	4,409	9,227	10,262
(BENEFIT) PROVISION FOR INCOME TAXES	856	1,404	2,774	3,238
NET (LOSS) INCOME BEFORE EARNINGS OF CONSOLIDATED SUBSIDIARIES	2,225	3,005	6,453	7,024
NET (LOSS) INCOME	$ 2,225	$ 3,005	$ 6,453	$ 7,024

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