Note 5 - Recent Accounting Pronouncements (Details Textual) - USD ($)	Jun. 30, 2020	Dec. 31, 2019	[1]	Jan. 01, 2019
Assets, Total	$ 60,549,000	$ 38,091,000
Accounting Standards Update 2016-02 [Member]
Assets, Total				$ 3,455,000

[1] The condensed consolidated balance sheet as of December 31, 2019 has been prepared using information from the audited consolidated balance sheet as of that date.