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Note 6 - Leases (Details Textual) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) | Aug. 08, 2019 USD ($) | Aug. 07, 2019 USD ($) | Jan. 01, 2019 USD ($)
Operating Lease, Weighted Average Discount Rate, Percent | 6.50% |  |  |  |  |
Finance Lease, Weighted Average Discount Rate, Percent | 8.10% |  |  |  |  |
Operating Lease, Weighted Average Remaining Lease Term (Year) | 1 year 292 days |  |  |  |  |
Finance Lease, Weighted Average Remaining Lease Term (Year) | 1 year 73 days |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 1,040,000 |  | $ 1,177,000 |  |  | $ 1,300,000
Operating Lease, Liability, Total | 1,354,000 |  |  |  |  | $ 1,800,000
Operating Lease, Cost | 663,000 |  |  |  |  |
Operating Lease, Cost | 612,000 |  |  |  |  |
Short-term Lease, Cost | 51,000 |  |  |  |  |
Variable Lease, Cost | 0 |  |  |  |  |
Operating Lease, Payments | $ 778,000 |  |  |  |  |
Operating Leases, Rent Expense, Net, Total |  | $ 809,000 |  |  |  |
SAVSU [Member] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-use Asset |  |  |  | $ 232,000 | $ 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 |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Year) | 5 years |  |  |  |  |
Monthly Base Rent Expense | $ 63,000 |  |  |  |  |
Menlo Park, California Location [Member] |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² | 1,250 |  |  |  |  |
Monthly Base Rent Expense | $ 5,000 |  |  |  |  |
Albuquerque, New Mexico Location [Member] |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² | 9,932 |  |  |  |  |
Monthly Base Rent Expense | $ 9,000 |  |  |  |  |
Detroit, Michigan Location [Member] |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² | 106,998 |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Year) | 5 years |  |  |  |  |
Monthly Base Rent Expense | $ 15,000 |  |  |  |  |

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