Note 5 - Leases (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Jan. 01, 2019
Operating Lease, Right-of-Use Asset	$ 797,000	$ 797,000	$ 859,000
Operating Lease, Payments		149,000
Operating Lease, Cost	$ 105,000	$ 208,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset				$ 966,000