Note 5 - Debt - Summary of Debt (Details) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Nov. 05, 2018
Related Party July 2018 Note Payable To Great Harbor LLC [Member]
Debt instrument, unamortized discount	$ 80	$ 201
Related Party November 2018 Note Payable To Great Harbor LLC [Member]
Debt instrument, unamortized discount	98	244	$ 1,214
Related Party Debt November 2014 Note Payable to Golisano Holdings LLC (Formerly Penta Mezzanine SBIC Fund I, L.P.) [Member]
Debt instrument, unamortized discount	40	100
Related-Party Debt January 2015 Note Payable to Golisano Holdings LLC (Formerly Payable to JL-BBNC Mezz Utah, LLC) [Member]
Debt instrument, unamortized discount	66	164
February 2015 Note Payable to Golisano Holdings LLC (Formerly Payable to Penta Mezzanine SBIC Fund I, L.P.) [Member]
Debt instrument, unamortized discount	$ 4	$ 9