Note 13 - Income Taxes (Detail) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current deferred tax asset:
Allowance for doubtful accounts receivable	$ 1,022	$ 1,174
Accrued expenses	7,490	7,946
	8,512	9,120
Current deferred tax liability:
Unrealized gains on marketable securities	(31,154)	(22,058)
Other	(1,832)	(1,588)
	(32,986)	(23,646)
Net current deferred tax liability	(24,474)	(14,526)
Noncurrent deferred tax asset:
Financial reporting depreciation in excess of tax depreciation	4,086	968
Deferred gain on sale of assets (net)	(3,135)	(3,135)
Tax basis intangible asset in excess of financial reporting basis	663	968
Stock-based compensation	1,682	1,283
Long-term investments	(1,387)	157
Accrued expenses	2,132	2,129
Deferred revenue	6,523	7,797
Net noncurrent deferred tax asset	$ 10,564	$ 10,167