Note 5 - Recent Accounting Pronouncements (Details Textual) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Assets, Total	$ 53,251,000	$ 38,091,000
Accounting Standards Update 2016-02 [Member]
Assets, Total			$ 3,455,000

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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+ Details