Note 13 - Leases (Details Textual)	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
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	1 year 292 days	1 year 292 days
Finance Lease, Weighted Average Remaining Lease Term	1 year 146 days	1 year 146 days
Operating Lease, Cost	$ 160,000	$ 444,000
Operating Lease, Payments	$ 204,000	$ 576,000
Bothell, Washington Headquarters [Member]
Lessee, Operating Lease, Renewal Term	5 years	5 years