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Note 5 - Stock-Based Compensation (Detail) - Restricted Stock Units (Restricted Stock Units (RSUs) [Member])	3 Months Ended
	Mar. 31, 2012
Restricted Stock Units (RSUs) [Member]
Balance at December 31, 2011	171,410
Balance at March 31, 2012	161,417
Granted	1,943
Forfeited	(122)
Vested	(11,814)

Number of shares related to Restricted Stock Award forfeited during the period.

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.