Note 8 - Commitments and Contingencies (Details Textual) - USD ($)	Jun. 30, 2019	Jan. 01, 2019
Operating Lease, Right-of-Use Asset	$ 1,111,000	$ 1,258,000
Operating Lease, Liability, Total	$ 1,111,000	$ 1,258,000
Operating Lease, Weighted Average Discount Rate, Percent	5.50%
Operating Lease, Weighted Average Remaining Lease Term	1 year 255 days