Note 4 - Share-Based Compensation (Detail) - Non-vested stock (USD $)	Mar. 31, 2013	Dec. 31, 2012
Outstanding at December 31, 2012	20,203	20,203
Outstanding at December 31, 2012 (in Dollars per share)	$ 34.65	$ 34.65
Outstanding at March 31, 2013	20,203	20,203
Outstanding at March 31, 2013 (in Dollars per share)	$ 34.65	$ 34.65

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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