Note 13 - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Deferred revenue and cancellation reserves	$ 39,323	$ 31,539
Allowances and accruals, including state tax carryforward amounts	43,185	29,198
Interest on derivatives	206	678
Goodwill	2,581	2,668
Capital loss carryforward	10,414	10,711
Valuation allowance	(5,360)	(8,663)
Total deferred tax assets	90,349	66,131
Deferred tax liabilities:
Inventories	(21,313)	(19,356)
Goodwill	(31,258)	(21,320)
Property and equipment, principally due to differences in depreciation	(84,355)	(67,271)
Prepaid expenses and other	(6,552)	(3,582)
Total deferred tax liabilities	(143,478)	(111,529)
Total	$ (53,129)	$ (45,398)