Note 3 - Stock-Based Compensation (Details) (USD $)	3 Months Ended	12 Months Ended		15 Months Ended		15 Months Ended
	Sep. 30, 2008	Dec. 31, 2013 Restricted Stock [Member] Maximum [Member]	Mar. 31, 2014 Common Stock [Member]	Mar. 31, 2014 Equity Incentive Plan [Member]	Dec. 31, 2013 Equity Incentive Plan [Member]	Mar. 31, 2014 Equity Incentive Plan [Member] Minimum [Member]	Mar. 31, 2014 Equity Incentive Plan [Member] Maximum [Member]
Note 3 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)				1,125,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		10 years				3 years	5 years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit				$ 2.88
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit				$ 22.54
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)					613,396
Share Price			$ 14.72
Restricted Common Stock, Shares, Grants in Period (in Shares)	200,000
Restricted Common Stock Grant Date Value	$ 12.13