Note 8 - Common Stock (Details) (USD $)	12 Months Ended					116 Months Ended			12 Months Ended								116 Months Ended		116 Months Ended	12 Months Ended		12 Months Ended				116 Months Ended	12 Months Ended			116 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 04, 2004	Dec. 31, 2013 Director Stock Option Plan [Member]	Dec. 31, 2013 Director Stock Option Plan [Member] Minimum [Member]	Dec. 31, 2013 Director Stock Option Plan [Member] Maximum [Member]	Dec. 31, 2012 Employee Stock Option [Member]	Dec. 31, 2011 Employee Stock Option [Member]	Dec. 31, 2013 Performance Shares [Member]	Dec. 31, 2012 Performance Shares [Member]	Dec. 31, 2011 Performance Shares [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 Restricted Stock [Member] Minimum [Member]	Dec. 31, 2011 Restricted Stock [Member] Minimum [Member]	Dec. 31, 2013 Restricted Stock [Member] Maximum [Member]	Dec. 31, 2013 Shareholder Rights Plan [Member]	Aug. 09, 2011 Shareholder Rights Plan [Member]	Dec. 31, 2013 Expected to Vest Only [Member]	Dec. 31, 2012 Expected to Vest Only [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2011 Maximum [Member]	Dec. 31, 2013 Maximum [Member]
Note 8 - Common Stock (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					5,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							1 year	3 years									3 years		6 years					1 year	1 year	3 years	4 years	4 years	4 years	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award						ten																								ten
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	49,000	194,500	219,500								542,500	900,500	150,500	0	9,000	72,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 4.33	$ 3.94	$ 2.98						$ 4.56	$ 2.05	$ 4.67	$ 3.80	$ 4.32
Allocated Share-based Compensation Expense	$ 344,000	$ 392,000	$ 162,000								$ 239,000	$ 147,000	$ 9,000	$ 103,000	$ 135,000	$ 188,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	2,187,000	2,053,000	1,332,000	1,470,000							1,375,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number											91,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	1,586,076	1,508,910
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term																						8 years 328 days	9 years 36 days
Share Price															$ 5.72			$ 4.41
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized														$ 124,000	$ 261,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition														1 year 73 days	2 years 36 days
Class of Warrant or Right, Exercise Price of Warrants or Rights																					39
Shareholder Rights Exercisable Conditions Beneficial Ownership Percentage	15.00%
Common Stock Redemption Discount																				50.00%
Shareholder Rights Percentage of Assets Cash Flow or Earning Power That Must Be Sold or Transferre to Trigger Discount	50.00%
Shareholder Rights Beneficial Owner Threshold Percentage for Exchange of Exercisable Rights for Common Stock	50.00%
Class of Warrant or Right, Redemption Price																				$ 0.001
Common Stock, Capital Shares Reserved for Future Issuance																				90,315,210