Note 5 - Stockholders' Equity and Earnings Per Common Share (Detail) - Changes in accumulated other comprehensive income, by category, net of tax (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Balance December 31	$ (313)	$ (314)
Balance December 31	5,951	4,596
Balance December 31	(922)	(898)
Balance December 31	4,716	3,384
Net change for the three months ended March 31	30	3
Net change for the three months ended March 31	(537)	125
Net change for the three months ended March 31	9	7
Net change for the three months ended March 31	(498)	135
Balance at March 31	(283)	(311)
Balance at March 31	5,414	4,721
Balance at March 31	(913)	(891)
Balance at March 31	$ 4,218	$ 3,519