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Note 4 - Cash and Cash Equivalents and Short-term Investments (Detail) - The Company includes certificates of deposit with a remaining maturity of 90 days or less at purchas (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Total Fair Value	$ 49,211	$ 44,855
Mutual Funds [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Total Fair Value	27,582	24,851
Mutual Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Total Fair Value	27,582	24,851
Mutual Funds [Member]
Gross Unrealized Gains (pre-tax)	337	383
Gross Unrealized Losses (pre-tax)	9
Municipal Bond Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Total Fair Value	21,629	20,004
Municipal Bond Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Total Fair Value	21,629	20,004
Municipal Bond Securities [Member]
Gross Unrealized Gains (pre-tax)	862	617
Gross Unrealized Losses (pre-tax)	128	15
Total Available For Sale Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Total Fair Value	49,211	44,855
Total Available For Sale Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Total Fair Value	27,582	24,851
Total Available For Sale Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Total Fair Value	21,629	20,004
Total Available For Sale Securities [Member]
Gross Unrealized Gains (pre-tax)	1,199	1,000
Gross Unrealized Losses (pre-tax)	$ 137	$ 15