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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
Jan. 01, 2019
Jun. 30, 2019
Dec. 31, 2018
Operating Lease, Right-of-Use Asset   $ 9,671,445
Operating Lease, Liability, Total   $ 9,789,038
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset $ 9,700,000    
Operating Lease, Liability, Total 9,800,000    
Cumulative Effect on Retained Earnings, Net of Tax, Total $ 100,000