Note 10 - Stockholders Equity (Details Textual) - USD ($)				1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 21, 2017	Dec. 21, 2016	Nov. 30, 2012	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	May 10, 2017	Dec. 31, 2016
Class of Warrant or Right, Outstanding				1,792,903		1,792,903		1,792,903			180,001
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.34		$ 0.34		$ 0.34			$ 0.57
Class of Warrant or Right, Issued During Period								1,612,902
Class of Warrant or Right, Issued During Period, Exercise Price								$ 0.31
Allocated Share-based Compensation Expense						$ 311,000	$ 167,000	$ 446,000	$ 318,000
Option Plan 2010 Member | Consultant [Member]
Stock Issued During Period, Shares, Issued for Services									3,031
Allocated Share-based Compensation Expense									$ 1,700
Warrants Issued in June 2016 [Member]
Class of Warrants or Rights, Vesting Period					1 year
Class of Warrants or Rights, Vested During the Period	15,000	15,000
Class of Warrant or Right, Outstanding				30,000		30,000		30,000
Class of Warrant or Right, Issued During Period					30,000
Class of Warrant or Right, Grants in Period, Grant-date Fair Value					$ 0.36
Warrant [Member]
Share Based Compensation Warrants Outstanding				150,001		150,001		150,001
Investors [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.55
Warrants Expiration Period			5 years
Cross River Partners, L.P. [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights										$ 0.31
Warrants Expiration Period				5 years
Class of Warrant or Right, Issued During Period				1,612,902
Class of Warrant or Right, Issued During Period, Exercise Price				$ 0.31
Class of Warrant or Right, Grants in Period, Grant-date Fair Value				$ 0.19