Note 7 - Leases - Lease Cost (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Lease Cost:
Operating	$ 613
Variable	111
Short-term	13
Total lease cost	737
Operating, cash paid for amounts included in measurement of lease liabilities	$ 604
Operating, weighted average remaining lease term (Year)	3 years 54 days
Operating, weighted-average discount rate	4.45%