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Note 11 - Leases (Details Textual)
1 Months Ended 12 Months Ended
Apr. 01, 2021
USD ($)
Jan. 31, 2021
USD ($)
a
Dec. 31, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
Operating Lease, Weighted Average Discount Rate, Percent     14.50%  
Operating Lease, Right-of-Use Asset     $ 847,000 $ 1,557,000
Operating Lease, Liability, Total     1,298,000 1,718,000
Operating Lease, Impairment Loss     333,000 0
Operating Lease, Cost     $ 645,000 $ 657,000
Operating Lease, Weighted Average Remaining Lease Term (Year)     1 year 6 months  
Operating Lease, Payments     $ 664,000  
Headquarters in San Diego, California [Member]        
Area of Real Estate Property (Square Foot)   8,511 500  
Monthly Lease Expense   $ 28,000 $ 2,000  
Monthly Sublease Payments $ 26,000