Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for doubtful accounts receivable	$ 2,077	$ 2,055
Accrued risk reserves	2,277	2,648
Accrued expenses	8,907	8,420
Financial reporting depreciation in excess of tax depreciation	8,642	9,142
Stock based compensation	387	3,511
Obligation to provide future services	1,262	1,342
Deferred revenue	3,942	4,258
Total deferred tax assets	29,628	33,369
Deferred tax liabilities:
Unrealized gains on marketable securities	(41,264)	(33,079)
Deferred gain on sale of assets (net)	(3,135)	(3,135)
Book basis in excess of tax basis of intangible assets	(1,481)	(945)
Book basis in excess of tax basis of securities	(2,416)	(2,344)
Long–term investments	(3,404)	(2,962)
Total deferred tax liabilities	(51,700)	(42,465)
Net deferred tax liability	(22,072)	(9,096)
Nonrefundable Entrance Fees [Member]
Deferred tax assets:
Entrance fees	211	163
Refundable Entrance Fees [Member]
Deferred tax assets:
Entrance fees	$ 1,923	$ 1,830