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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 |  |  |  |  |

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