Note 9 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Lease, Weighted Average Remaining Lease Term (Year)	7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	7.00%
Variable Lease, Payment	$ 29
Short-term Lease, Cost	0	$ 0
Improved Office and Warehouse in Tempe, Arizona [Member]
Operating Lease, Right-of-Use Asset, Amortization Expense	88	122
Operating Lease, Expense	$ 95	$ 137