Note 6 - Stockholders' Equity (Detail) - Summary of warrant activity: (USD $)	12 Months Ended											12 Months Ended
	Dec. 31, 2012	Oct. 24, 2016	Jun. 22, 2016	Mar. 26, 2016	Mar. 19, 2016	Feb. 12, 2016	Jun. 17, 2015	Mar. 02, 2015	Oct. 31, 2012	Mar. 31, 2012	Jun. 30, 2010	Dec. 31, 2012 Warrant [Member]	Dec. 31, 2011 Warrant [Member]	Oct. 31, 2012 Warrant [Member]
Outstanding at December 31, 2010		4,312,500	1,468,125	634,189	1,921,795	929,826	176,175	935,385				10,121,219	7,530,689
Outstanding at December 31, 2010 (in Dollars per Item)		3.00	5.00	1.60	1.60	1.60	5.00	2.00	0.0094	5.00		3.76	3.71
Outstanding at December 31, 2010										123,077	176,175	12,564,193	9,450,633	562,500
Number of Warrants												4,312,500	3,112,425
Weighted Average Exercise Price (in Dollars per share)	$ 1.32											$ 3.00	$ 4.76
Number of Common Shares Exercisable Into												4,312,500	3,112,425
Weighted Average Exercise Price (in Dollars)												$ (0.18)	$ (0.70)
Number of Common Shares Exercisable Into													592,341
Exercised (in Dollars per share)													$ 3.96
Exercised													(371,206)
Exercised													(301,895)
Number of Warrants												(4,055,724)	(220,000)
Weighted Average Exercise Price (in Dollars per share)	$ 1.73											$ 5.07	$ 8.09
Number of Common Shares Exercisable Into												(6,498,698)	(220,000)
Number of Warrants		4,312,500	1,468,125	634,189	1,921,795	929,826	176,175	935,385				10,377,995	10,121,219
Weighted Average Exercise Price (in Dollars per Item)		3.00	5.00	1.60	1.60	1.60	5.00	2.00	0.0094	5.00		2.94	3.76
Number of Common Shares Exercisable Into										123,077	176,175	10,377,995	12,564,193	562,500