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Note 7 - Commitments and Contingencies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Operating Lease, Weighted Average Discount Rate, Percent | 5.50% |  |
Operating Lease, Weighted Average Remaining Lease Term | 1 year 36 days |  |
Due to Related Parties, Total | $ 274,000 |  |
Operating Lease, Expense | 563,000 |  |
Operating Lease, Payments | 565,000 |  |
Operating Leases, Rent Expense, Total | 439,000 | $ 382,000 |
Cost of Sales [Member] |  |  |
Operating Lease, Expense | 230,000 |  |
General and Administrative Expense [Member] |  |  |
Operating Lease, Expense | 210,000 |  |
Research and Development Expense [Member] |  |  |
Operating Lease, Expense | 123,000 |  |
Operating Leases for Offshore Subsidiaries [Member] |  |  |
Operating Leases, Future Minimum Payments Due, Total | 78,000 |  |
Other Noncurrent Assets [Member] |  |  |
Operating Lease, Liability, Total | 945,000 |  |
Other Current Liabilities and Long-term Lease Obligation [Member] |  |  |
Operating Lease, Right-of-Use Asset | $ 945,000 |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Liability, Total |  |  | $ 1,258,000
Operating Lease, Right-of-Use Asset |  |  | $ 1,258,000

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