Note 8 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lease Cost:
Operating	$ 305	$ 307
Variable	57	57
Short-term	7	6
Total lease cost	369	370
Operating, cash paid for amounts included in measurement of lease liabilities	$ 305	$ 303
Operating, weighted average remaining lease term (Year)	2 years 164 days	3 years 135 days
Operating, weighted-average discount rate	4.45%	4.45%