Note 10 - Equity, Share-based Compensation and Warrants - Share-based Compensation Expenses Related to Employees and Directors (Details) - The 2014 Equity Incentive Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Compensation expense related to common stock awards issued under equity incentive plan	$ 412	$ 1,261
Restricted Stock Units (RSUs) [Member]
Compensation expense related to common stock awards issued under equity incentive plan	316	1,160
Share-Based Payment Arrangement, Option [Member]
Compensation expense related to common stock awards issued under equity incentive plan	$ 96	$ 101