Note 6 - Stockholders' Equity (Detail) (USD $)	1 Months Ended				12 Months Ended
	Oct. 31, 2012	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 24, 2016	Jun. 22, 2016	Mar. 26, 2016	Mar. 19, 2016	Feb. 12, 2016	Jun. 17, 2015	Mar. 02, 2015	Mar. 31, 2012
Number of Units in Public Offering	7,500,000
Unit Price (in Dollars per share)	$ 2.00		$ 4.00
Number of Common Stock Shares for Each Unit	1
Share Price (in Dollars per share)	$ 0.005				$ 4.45	$ 2.48
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			176,175												123,077
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)	0.0094							3.00	5.00	1.60	1.60	1.60	5.00	2.00	5.00
Underwriter Option Days to Exercise	30 days
Stock Issued During Period, Shares, New Issues	1,025,000	1,400,000
Warrants Purchased	562,500
Warrants Not Settleable in Cash, Fair Value Disclosure (in Dollars)	$ 4,521,681		$ 2,525,175
Stock Repurchased During Period, Shares			2,936,250	1,015,385
Proceeds from Issuance of Common Stock (in Dollars)		7,730,000	23,500,000	5,000,002	15,675,727	21,946,801	12,234,693
Stock Issued During Period, Value, New Issues (in Dollars)		8,386,000			15,920,584	21,870,362	12,147,904
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures					11,323,831,459,393		1,175,930
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)					$ 1.32	$ 4.04	$ 2.66
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value (in Dollars)					1,549,888	5,381,855	3,222,417
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)					1,485	818,723	921,258
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)		396,672					396,672
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition					302 days
Per Whole Share [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)	3.00
Warrant [Member]
Number of Warrants For Each Share of Common Stock	1
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	562,500	9,450,633			10,377,995	12,564,193	9,450,633
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)		3.71			2.94	3.76	3.71
Common Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	0.5
Stock Issued During Period, Shares, New Issues					8,525,000	5,872,500	2,938,462
Stock Issued During Period, Value, New Issues (in Dollars)					$ 42,625	$ 29,363	$ 14,692
Additional Shares of Common Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	1,125,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)	1.995
Common Stock and Warrants [Member]
Stock Issued During Period, Shares, New Issues			5,872,500	1,538,462
From [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)	4.00
To [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)	2.00
Unit Consisting Of (i) [Member]
Number of Common Stock Shares for Each Unit			1
Unit Consisting Of (ii) [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			0.25
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)			4.50
Unit Consisting Of (iii) [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			0.25
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)			5.00