Note 1 - Organization and Significant Accounting Policies - Revision of Error (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Right of Use Operating Lease Asset	$ 394	$ 362	$ 832
Operating Lease Liability - Current	149	182	522
Operating Lease Liability - Non Current	$ 237	180	$ 310
Previously Reported [Member]
Right of Use Operating Lease Asset		980
Operating Lease Liability - Current		300
Operating Lease Liability - Non Current		680
Revision of Prior Period, Error Correction, Adjustment [Member]
Right of Use Operating Lease Asset		(618)
Operating Lease Liability - Current		(118)
Operating Lease Liability - Non Current		$ (500)