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