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Note 12 - Leases (Details Textual) - USD ($)
Jan. 01, 2019
Mar. 31, 2019
Dec. 31, 2018
Assets, Noncurrent, Excluding Property, Plant, and Equipment   $ 4,105,573 $ 1,935,119
Liabilities, Current, Total   32,211,059 30,208,712
Liabilities, Noncurrent, Total   $ 2,995,263 $ 2,296,393
Accounting Standards Update 2016-02 [Member]      
Assets, Noncurrent, Excluding Property, Plant, and Equipment $ 2,400,000    
Liabilities, Current, Total 1,000,000    
Liabilities, Noncurrent, Total 1,400,000    
Cumulative Effect on Retained Earnings, Net of Tax, Total $ 0