Note 8 - Income Taxes (Details) - Approximate Amount Of Unused Operating Loss Carry Forwards and Expiration Dates (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2033	Dec. 31, 2032	Dec. 31, 2031	Dec. 31, 2030	Dec. 31, 2029	Dec. 31, 2028	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 03, 2013	Feb. 05, 2013	Dec. 31, 2012	Jul. 25, 2011
Approximate Amount Of Unused Operating Loss Carry Forwards and Expiration Dates [Abstract]
Approximate Amount of Unused Operating Loss Carry Forwards	$ 10,397	$ 20,558	$ 21,386	$ 18,145	$ 18,547	$ 11,905	$ 7,361	$ 8,168	$ 15,647	$ 2,293	$ 4,843
Expiration During Year Ended	Dec. 31, 2033	Dec. 31, 2032	Dec. 31, 2031	Dec. 31, 2030	Dec. 31, 2029	Dec. 31, 2028	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
$	$ 139,250											$ 34,000	$ 34,000	$ 139,000	$ 90,000