Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Deferred revenue and cancellation reserves	$ 49,332	$ 39,323
Allowances and accruals, including state NOL carryforward amounts	49,074	43,185
Interest on derivatives		206
Credits and other	1,781	2,581
Capital loss carryforward		10,414
Valuation allowance	(227)	(5,360)
Total deferred tax assets	99,960	90,349
Deferred tax liabilities:
Inventories	(22,253)	(21,313)
Goodwill	(41,107)	(31,258)
Property and equipment, principally due to differences in depreciation	(93,943)	(84,355)
Prepaid expenses and other	(1,732)	(6,552)
Total deferred tax liabilities	(159,035)	(143,478)
Total	$ (59,075)	$ (53,129)