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Note 13 - Leases (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
ft²
a
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
ft²
a
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Aug. 08, 2019
USD ($)
Aug. 07, 2019
USD ($)
Jan. 01, 2019
USD ($)
Operating Lease, Weighted Average Discount Rate, Percent 6.50%   6.50%          
Finance Lease, Weighted Average Discount Rate, Percent 8.10%   8.10%          
Operating Lease, Weighted Average Remaining Lease Term (Year) 1 year 3 months 18 days   1 year 3 months 18 days          
Finance Lease, Weighted Average Remaining Lease Term (Year) 8 months 12 days   8 months 12 days          
Operating Lease, Right-of-Use Asset $ 740,000   $ 740,000   $ 1,040,000     $ 1,300,000
Operating Lease, Liability, Total 960,000   960,000         $ 1,800,000
Lease Cost, Operating Leases 229,000   456,000          
Operating Lease, Cost 170,000   339,000          
Short-term Lease, Cost 59,000   117,000          
Variable Lease, Cost 0   0          
Operating Lease, Payments $ 217,000   $ 434,000          
Operating Leases, Rent Expense, Net, Total   $ 142,000   $ 186,000        
SAVSU [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-use Asset           $ 233,000 $ 233,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Liability           $ 232,000    
Bothell, Washington Headquarters [Member]                
Area of Real Estate Property (Square Foot) | ft² 32,106   32,106          
Lessee, Operating Lease, Renewal Term (Year) 5 years   5 years          
Monthly Base Rent Expense     $ 63,000          
Menlo Park, California Location [Member]                
Area of Real Estate Property (Square Foot) | ft² 1,250   1,250          
Monthly Base Rent Expense     $ 5,000          
Albuquerque, New Mexico Location [Member]                
Area of Real Estate Property (Square Foot) | ft² 9,932   9,932          
Lessee, Operating Lease, Renewal Term (Year) 3 years   3 years          
Monthly Base Rent Expense     $ 9,000          
Detroit, Michigan Location [Member]                
Area of Real Estate Property (Square Foot) | a 106,998   106,998          
Lessee, Operating Lease, Renewal Term (Year) 60 months   60 months          
Monthly Base Rent Expense     $ 15,000