Note 13 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current deferred tax asset:
Allowance for doubtful accounts receivable	$ 1,802	$ 1,022
Accrued expenses	7,489	7,490
	9,291	8,512
Current deferred tax liability:
Unrealized gains on marketable securities	(28,526)	(31,154)
Other	(1,922)	(1,832)
	(30,448)	(32,986)
Net current deferred tax liability	(21,157)	(24,474)
Noncurrent deferred tax asset:
Financial reporting depreciation in excess of tax depreciation	5,872	4,086
Deferred gain on sale of assets (net)	(3,135)	(3,135)
Tax basis intangible asset in excess of financial reporting basis	127	663
Stock-based compensation	2,214	1,682
Long-term investments	(2,276)	(1,387)
Obligation to provide future services	1,439	698
Accrued expenses	2,502	2,132
Deferred revenue	6,096	6,523
Net noncurrent deferred tax asset	14,531	12,817
Nonrefundable Entrance Fees [Member]
Noncurrent deferred tax asset:
Entrance fees	45
Refundable Entrance Fees [Member]
Noncurrent deferred tax asset:
Entrance fees	$ 1,647	$ 1,555