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Note 5 - Recent Accounting Pronouncements (Details Textual) - USD ($)
Oct. 01, 2018
May 31, 2018
Lessee, Operating Lease, Discount Rate   4.00%
Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member]    
Operating Lease, Right-of-Use Asset $ 500,000  
Operating Lease, Liability, Total $ 500,000