Note 3 - Stock-Based Compensation (Detail) - Restricted Stock Award Forfeitures (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Shares Forfeited				(827)
Restricted Stock [Member]
Date Deemed Forfeited and Recorded as Treasury Stock	February 28, 2013	February 28, 2013	February 28, 2013	June 30, 2011	June 30, 2011	June 30, 2010
Shares Forfeited	9,000	9,000	9,000	15,000	8,000	9,000
Expense Recovered (in Dollars)	$ 56	$ 65	$ 78	$ 101	$ 66	$ 70
Date Shares Returned to Plan	April 1, 2016	April 1, 2015	April 1, 2014	April 1, 2013	April 1, 2012	April 1, 2011