Note 11 - Share-Based Payments (Details) (USD $)	1 Months Ended	6 Months Ended	12 Months Ended		12 Months Ended		1 Months Ended		6 Months Ended			6 Months Ended	12 Months Ended
	Sep. 30, 2005	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013	Dec. 31, 2009 Scenario i (Member)	Dec. 31, 2009 Scenario ii (Member)	Sep. 30, 2005 Employee Stock Option [Member]	Sep. 30, 2005 Maximum Maturity (Member)	Jun. 30, 2012 Restricted Stock 2 (Member)	Sep. 30, 2005 2005 Equity Incentive Plan [Member]	Dec. 31, 2009 2009 Employee Stock Purchase Plan [Member]	Jun. 30, 2013 Weighted-average remaining service period (Member)	Dec. 31, 2012 Minimum [Member]
Note 11 - Share-Based Payments (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized										13,000,000	1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee	1,500,000
Share-based Goods and Nonemployee Services Transaction, Valuation Method, Expected Term								10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year					4 years						1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)		$ 0.35
Allocated Share-based Compensation Expense (in Dollars)			$ 23,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)				$ 100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition												1 year 29 days
Stock Issued During Period, Shares, Restricted Stock Award, Gross									100,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent					85.00%	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				78,267