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Note 3 - Earnings Per Share (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	61,132	88,774	79,693	88,774
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit (in Dollars per share)	$ 17.55	$ 17.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit (in Dollars per share)	$ 40.24	$ 40.24
Incremental Common Shares Attributable to Share-based Payment Arrangements	10,647	603
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,515	79,774
Stock Options [Member]
Incremental Common Shares Attributable to Share-based Payment Arrangements	59,617	9,000

X

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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