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Note 1 - Basis of Presentation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Dec. 31, 2018
Common Stock, Capital Shares Reserved for Future Issuance (in shares) 471,144 471,144    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0 0    
Operating Lease, Right-of-Use Asset $ 2,477,817    
Operating Lease, Liability, Total $ 2,478,000      
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset     $ 2,800,000  
Operating Lease, Liability, Total     $ 2,800,000