Note 3 - Stock-Based Compensation (Detail) - Assumptions Used to Value Stock Options Granted	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Minimum [Member]
Expected volatility	55.30%	22.60%
Risk-free interest rate	0.60%	0.70%
Expected life (in years)	4 years	4 years 47 days
Maximum [Member]
Dividend yield	0.00%	0.00%
Expected volatility	64.00%	67.10%
Risk-free interest rate	0.70%	1.70%
Expected life (in years)	4 years 3 months	4 years 3 months