Note 3 - Stock-based Compensation and Shareholders' Equity (Details) (USD $)	3 Months Ended		9 Months Ended			189 Months Ended	9 Months Ended	105 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 1998 Plan [Member]	Sep. 30, 2013 2005 Plan [Member]	Sep. 30, 2013 2005 Plan [Member]
Note 3 - Stock-based Compensation and Shareholders' Equity (Details) [Line Items]
Employee Benefits and Share-based Compensation (in Dollars)	$ 18,000	$ 16,000	$ 48,000	$ 57,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options (in Dollars)	$ 103,000		$ 103,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						220,500	200,000	200,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			20,000			225,058		143,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period						30,444		45,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			28,725			164,814		11,100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	116,900		116,900		128,225	29,800	87,100	87,100
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award							The terms of the 2005 Plan are identical to the 1998 Plan, except options expire five years after the grant date.
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)			$ 4.52	$ 3.81