Note 13 - Equity Plans (Detail) - Stock Based Compensation Expense Recognized on Restricted Stock Units (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impact per basic share	$ (0.92)	$ 0.15	$ 0.41	$ 0.57	$ 0.05	$ 0.56	$ 0.73	$ 0.94	$ 0.21	$ 2.28	$ 0.20
Impact per diluted share	$ (0.92)	$ 0.15	$ 0.41	$ 0.57	$ 0.05	$ 0.56	$ 0.73	$ 0.94	$ 0.21	$ 2.28	$ 0.20
Restricted Stock Units (RSUs) [Member] | Expense Before Tax [Member]
Share Based Compensation Expense (in Dollars)									$ 1,238	$ 726	$ 567
Restricted Stock Units (RSUs) [Member] | Expense After Tax [Member]
Share Based Compensation Expense (in Dollars)									278	484	318
Restricted Stock Units (RSUs) [Member]
Impact per basic share									$ 0.03	$ 0.04	$ 0.03
Impact per diluted share									$ 0.03	$ 0.04	$ 0.03
Impact Share Type [Member]
Impact per basic share											$ 0
Impact per diluted share											$ 0
Expense Before Tax [Member]
Share Based Compensation Expense (in Dollars)											60
Expense After Tax [Member]
Share Based Compensation Expense (in Dollars)											$ 34