Note 1 - Summary of Significant Accounting Policies - Cost and Carrying Value of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Cost	$ 124,249	$ 120,298
Accumulated Depreciation and Amortization	(63,835)	(62,131)
Property and equipment, net	60,414	58,167
Sales Facilities [Member]
Cost	60,964	59,374
Accumulated Depreciation and Amortization	(25,802)	(26,920)
Property and equipment, net	35,162	32,454
Airplane [Member]
Cost	31,230	31,013
Accumulated Depreciation and Amortization	(10,145)	(9,488)
Property and equipment, net	21,085	21,525
Computer, Software and Equipment [Member]
Cost	22,660	21,507
Accumulated Depreciation and Amortization	(20,730)	(19,374)
Property and equipment, net	1,930	2,133
Leasehold Improvements [Member]
Cost	7,339	6,827
Accumulated Depreciation and Amortization	(5,817)	(5,188)
Property and equipment, net	1,522	1,639
Other Capitalized Property Plant and Equipment [Member]
Cost	2,056	1,577
Accumulated Depreciation and Amortization	(1,341)	(1,161)
Property and equipment, net	$ 715	$ 416