Note 5 - Stock-based Compensation (Details) - Summary of Award Activity Related to Our Common Stock (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013
Stock options - common:
Outstanding - beginning of period	1,316,068	274,746	274,746
Outstanding - beginning of period	$ 5.98	$ 1.99	$ 1.99
Options exercised	(15,000)
Options exercised	$ 3.11
Options expired	(921,500)
Options expired	$ 7.64
Outstanding - end of period	379,568	274,746	274,746
Outstanding - end of period	$ 2.06	$ 1.99	$ 1.99
Exercisable at end of period	20,000	68,688
Exercisable at end of period	$ 3.23	$ 1.99