Note 5 - Stock-Based Compensation (Details) - Restricted Stock Units (Restricted Stock Units (RSUs) [Member])	6 Months Ended
	Jun. 30, 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 June 30, 2014	118,514
Granted	17,601
Vested	(42,520)