Note 9 - Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Lessee, Operating and Finance Lease, Renewal Term	10 years
Operating Lease, Expense	$ 1.6
Operating Leases, Rent Expense, Total		$ 1.3
Minimum [Member]
Operating and Finance Lease, Remaining Term	2 years
Maximum [Member]
Operating and Finance Lease, Remaining Term	15 years