Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	Mar. 31, 2019	Jan. 01, 2019
Operating Lease, Liability, Total	$ 1,131,000	$ 1,258,000
Operating Lease, Right-of-Use Asset	$ 1,131,000	1,258,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total		1,258,000
Operating Lease, Right-of-Use Asset		$ 1,258,000