Note 7 - Common Stock (Details) - USD ($)		1 Months Ended						2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	May. 14, 2015	Jun. 30, 2015	May. 31, 2015	Mar. 31, 2015	Feb. 28, 2015	Sep. 30, 2014	Sep. 23, 2014	Nov. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Note 7 - Common Stock (Details) [Line Items]
Stock Issued During Period, Shares, New Issues (in Shares)							11,305,567
Proceeds from Issuance of Private Placement, Gross (in Dollars)	$ 12,000,000
Proceeds from Issuance of Private Placement, Net (in Dollars)	$ 11,040,000
Class of Warrant or Right, Outstanding (in Shares)		2,864,823							2,864,823		2,864,823
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)		2,864,823			605,556		940,189	382,000	2,864,823		2,864,823
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)					$ 0.50		$ 0.53	$ 0.53
Warrant Term							5 years
Percent of Outstanding Loan Amount		1.00%							1.00%		1.00%
Allocated Share-based Compensation Expense (in Dollars)									$ 48,000	$ 17,000	$ 90,000	$ 30,000
Private Placement [Member]
Note 7 - Common Stock (Details) [Line Items]
Right to Shares Agreement, Common Shares Cancelled (in Shares)											854,989
Right to Shares Agreement, Obligated to Issue, Shares (in Shares)		956,354							956,354		956,354
Right to Shares Agreement, Not Issued Due to Beneficial Ownership Limitations, Shares (in Shares)											101,365
Right to Shares Agreement, Delivery of Shares, Days Obligated											3 days
Right to Shares Agreement, Common Stock, Shares Issued (in Shares)		566,038											390,316
Right to Shares Agreement, Additional Shares Issuable (in Shares)		0							0		0
Stock Issued During Period, Shares, New Issues (in Shares)	32,432,432
Share Price (in Dollars per share)	$ 0.37
Proceeds from Issuance of Private Placement, Gross (in Dollars)	$ 12,000,000
Proceeds from Issuance of Private Placement, Net (in Dollars)	$ 11,040,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)		940,189							940,189		940,189
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)		$ 0.53							$ 0.53		$ 0.53
Warrant Term									5 years
September 2014 Term Loan [Member]
Note 7 - Common Stock (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)			25,000			471,698
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)			$ 0.37			$ 0.53
Warrant Term			10 years			10 years
Warrants and Rights Outstanding (in Dollars)			$ 10,000
Amortization of Debt Discount (Premium) (in Dollars)									$ 8,000		$ 8,000
Unamortized Debt Issuance Expense (in Dollars)		$ 2,000							2,000		2,000
Vendors and Nonemployee [Member]
Note 7 - Common Stock (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights, Cancelled in Period (in Shares)			33,750
Warrant [Member]
Note 7 - Common Stock (Details) [Line Items]
Fair Value Assumptions, Expected Dividend Rate					0.00%			0.00%
Fair Value Assumptions, Expected Volatility Rate					77.60%			61.30%
Fair Value Assumptions, Risk Free Interest Rate					2.14%
Fair Value Assumptions, Expected Term					10 years			5 years
Warrant [Member] | September 2014 Term Loan [Member]
Note 7 - Common Stock (Details) [Line Items]
Fair Value Assumptions, Expected Dividend Rate			0.00%
Fair Value Assumptions, Expected Volatility Rate			80.10%
Fair Value Assumptions, Risk Free Interest Rate			2.23%
Fair Value Assumptions, Expected Term			10 years
Warrant [Member] | Vendors and Nonemployee [Member]
Note 7 - Common Stock (Details) [Line Items]
Allocated Share-based Compensation Expense (in Dollars)									6,000		13,000
Warrant [Member] | Employees [Member]
Note 7 - Common Stock (Details) [Line Items]
Allocated Share-based Compensation Expense (in Dollars)									0		244,000
March 2015 Issuance [Member]
Note 7 - Common Stock (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)				11,628
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)				$ 0.34
Fair Value Assumptions, Expected Dividend Rate				0.00%
Fair Value Assumptions, Expected Volatility Rate				78.90%
Fair Value Assumptions, Risk Free Interest Rate				1.94%
Fair Value Assumptions, Expected Term				10 years
Allocated Share-based Compensation Expense (in Dollars)									0		3,000
May 2015 Issuance [Member]
Note 7 - Common Stock (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)			289,827
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)			$ 0.53
Fair Value Assumptions, Expected Dividend Rate			0.00%
Fair Value Assumptions, Expected Volatility Rate			80.10%
Fair Value Assumptions, Risk Free Interest Rate			2.28%
Fair Value Assumptions, Expected Term			10 years
Allocated Share-based Compensation Expense (in Dollars)									73,000		73,000
May 2015 Issuance, Second Contractor [Member]
Note 7 - Common Stock (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)			172,675
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)			$ 0.53
Fair Value Assumptions, Expected Dividend Rate			0.00%
Fair Value Assumptions, Expected Volatility Rate			64.40%
Fair Value Assumptions, Risk Free Interest Rate			1.54%
Fair Value Assumptions, Expected Term			5 years
Allocated Share-based Compensation Expense (in Dollars)									38,000		47,000
September 2014 Term Loan [Member]
Note 7 - Common Stock (Details) [Line Items]
Warrant Term						10 years
Warrants and Rights Outstanding (in Dollars)						$ 622,000
Fair Value Assumptions, Expected Dividend Rate						0.00%
Fair Value Assumptions, Expected Volatility Rate						77.00%
Fair Value Assumptions, Risk Free Interest Rate						2.50%
Amortization of Debt Discount (Premium) (in Dollars)									47,000		94,000
Unamortized Debt Issuance Expense (in Dollars)		$ 479,000							$ 479,000		$ 479,000
Minimum [Member] | Warrant [Member]
Note 7 - Common Stock (Details) [Line Items]
Fair Value Assumptions, Risk Free Interest Rate								1.55%
Maximum [Member] | Warrant [Member]
Note 7 - Common Stock (Details) [Line Items]
Fair Value Assumptions, Risk Free Interest Rate								1.65%