Note 10 - Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Leases, Rent Expense, Net, Total		$ 779,000	$ 869,000
Minimum [Member]
Operating Lease, Remaining Lease Term	1 year
Maximum [Member]
Operating Lease, Remaining Lease Term	5 years 255 days