Note 6 - Leases - Additional Lease Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Operating lease cost	$ 486	$ 1,340
Short-term lease cost	71	203
Total lease cost	557	1,543
Cash paid for amounts included in the measurement of operating lease liabilities	498	1,457
Right-of-use assets obtained in exchange for new operating leae liabilities	$ 69	$ 879
Weighted average remaining lease term - operating leases (years) (Year)	4 years 73 days	4 years 73 days
Weighted average discount rate - operating leases	5.25%	5.25%