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Note 8 - Leases (Details Textual) - USD ($)
Jun. 30, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Lease, Right-of-Use Asset $ 9,334,911 $ 9,473,587 $ 10,100,000
Operating Lease, Liability, Total 9,364,989 9,490,385 $ 10,100,000
Finance Lease, Right-of-Use Asset   453,485    
Finance Lease, Liability, Total $ 426,272 $ 453,485    
Minimum [Member]        
Lessee, Operating Lease, Renewal Term 1 year      
Lessee, Finance Lease, Renewal Term   1 year    
Maximum [Member]        
Lessee, Operating Lease, Renewal Term 20 years      
Lessee, Finance Lease, Renewal Term   20 years