Note 2 - New Authoritative Accounting Guidance (Details Textual) - USD ($)	Mar. 31, 2019	Jan. 01, 2019
Operating Lease, Right-of-Use Asset	$ 3,200,000
Operating Lease, Liability, Total	$ 3,576,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset		$ 3,600,000
Operating Lease, Liability, Total		$ 3,600,000