Note 1 - Summary of Significant Accounting Policies - Cost and Carrying Value of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cost	$ 120,298	$ 58,671
Accumulated Depreciation and Amortization	(62,131)	(32,232)
Property and equipment, net	58,167	26,439
Sales Facilities [Member]
Cost	59,374
Accumulated Depreciation and Amortization	(26,920)
Property and equipment, net	32,454
Airplane [Member]
Cost	31,013	30,423
Accumulated Depreciation and Amortization	(9,488)	(8,866)
Property and equipment, net	21,525	21,557
Computer, Software and Equipment [Member]
Cost	21,507	20,287
Accumulated Depreciation and Amortization	(19,374)	(17,611)
Property and equipment, net	2,133	2,676
Leasehold Improvements [Member]
Cost	6,827	6,600
Accumulated Depreciation and Amortization	(5,188)	(4,765)
Property and equipment, net	1,639	1,835
Other Capitalized Property Plant and Equipment [Member]
Cost	1,577	1,361
Accumulated Depreciation and Amortization	(1,161)	(990)
Property and equipment, net	$ 416	$ 371