Note 5 - Stock-Based Compensation (Details) - Restricted Stock Units (Restricted Stock Units (RSUs) [Member])	3 Months Ended
	Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
Note 5 - Stock-Based Compensation (Details) - Restricted Stock Units [Line Items]
Balance at December 31, 2013	143,433
Balance at March 31, 2014	148,245
Granted	4,812