Note 6 - Long-term Debt (Details Textual) - USD ($) $ in Thousands	Apr. 23, 2018	Oct. 20, 2017	Mar. 26, 2018	Mar. 09, 2018	Feb. 27, 2018	Feb. 26, 2018
London Interbank Offered Rate (LIBOR) [Member] | Term Loan B [Member]
Derivative, Fixed Interest Rate		4.49%
Debt Instrument, Basis Spread on Variable Rate	2.00%	2.25%
Interest Rate Swap [Member]
Derivative, Amount of Hedged Item		$ 1,050,000	$ 200,000	$ 100,000	$ 200,000	$ 200,000
Derivative, Fixed Interest Rate		4.0275%	4.176%	4.49%	4.589%