The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Note 6 - Stock-Based Compensation (Detail) - Stock Options Outstanding (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Stock options outstanding (in Shares)	732,363	831,393	874,025	995,005
Weighted-average exercise price	$ 11.03	$ 11.19	$ 10.99	$ 10.54
Weighted-average remaining contractual life	3 years 178 days
Exercise Price 6.05-8.10 [Member]
Lower limit of price range	$ 6.05
Upper limit of price range	$ 8.10
Stock options outstanding (in Shares)	274,456
Weighted-average exercise price	$ 6.51
Weighted-average remaining contractual life	5 years 200 days
Exercise Price 8.11-11.07 [Member]
Lower limit of price range	$ 8.11
Upper limit of price range	$ 11.07
Stock options outstanding (in Shares)	208,955
Weighted-average exercise price	$ 10.11
Weighted-average remaining contractual life	1 year 244 days
Exercise Price 11.08-15.43 [Member]
Lower limit of price range	$ 11.08
Upper limit of price range	$ 15.43
Stock options outstanding (in Shares)	136,196
Weighted-average exercise price	$ 11.91
Weighted-average remaining contractual life	2 years 138 days
Exercise Price 15.44-26.86 [Member]
Lower limit of price range	$ 15.44
Upper limit of price range	$ 26.86
Stock options outstanding (in Shares)	112,756
Weighted-average exercise price	$ 22.64
Weighted-average remaining contractual life	3 years 62 days