Note 2 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended			12 Months Ended
	Apr. 16, 2015	Mar. 31, 2016 USD ($) shares	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($) shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers		0		0
Concentration Risk, Percentage		13.00%		14.00%
UNITED STATES
Cash and Cash Equivalents, at Carrying Value		$ 1,600,000
UNITED KINGDOM
Deferred Revenue		2,500,000			$ 2,700,000
Revolving Credit Facility [Member] | Senior Secured Revolving Credit Facility [Member]
Debt Related Commitment Fees and Debt Issuance Costs		0		$ 0
Debt Issuance Costs, Gross		$ 8,500,000
Write off of Deferred Debt Issuance Cost			$ 274,000
Debt Instrument, Term	5 years	5 years
Amortization of Debt Issuance Costs		$ 148,000		361,000
Senior Notes 2023 [Member]
Debt Instrument, Face Amount		$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.625%
Employee Stock Option [Member] | Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense		$ 921,000		1,400,000
Employee Stock Option [Member] | Cost of Sales [Member]
Allocated Share-based Compensation Expense		$ 307,000		469,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | shares		0
Allocated Share-based Compensation Expense		$ 1,200,000		1,900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 3,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		1 year 73 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 860,000
Time Lapse Restricted Stock and RSUs [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
Time Lapse Restricted Stock and RSUs [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		5 years
Restricted Stock and RSUs [Member] | Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense		$ 4,200,000		4,100,000
Restricted Stock and RSUs [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 41,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 73 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 5,800,000		3,200,000
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense		0		130,000
Reclassification of Deferred Financing Costs to Notes Payable [Member] | December 31, 2015 [Member]
Prior Period Reclassification Adjustment		6,900,000
Reclassification of Deferred Financing Costs to Notes Payable [Member]
Current Period Reclassification Adjustment		6,600,000
Cash Equivalents, at Carrying Value		0			0
Allowance for Doubtful Accounts Receivable		12,500,000			12,200,000
Impairment of Long-Lived Assets Held-for-use		0			0
Cash and Cash Equivalents, at Carrying Value		15,999,000		20,282,000	$ 47,865,000	$ 9,751,000
Cash, FDIC Insured Amount		250,000
Goodwill, Impairment Loss		0
Amortization of Debt Issuance Costs		$ 381,000		$ 587,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares		86,000		32,000