Note 12 - Leases - Lease Cost and Information (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating lease cost	$ 517,000
Short-term lease cost	119,000
Total lease cost	636,000
Operating cash flows from operating leases	$ 459,000
Weighted -average remaining lease term - operating leases (in years) (Year)	10 years
Weighted -average discount rate - operating leases	3.48%