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Note 10 - Income Taxes - Components of Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current:    
Federal $ 1,091,216 $ (71,070)
State 11,580 2,504
Total current tax provision 1,102,796 (68,566)
Deferred:    
Federal 831,148 (435,495)
State
Total deferred tax provision 831,148 (435,495)
Income tax (benefit)/expense $ 1,933,944 $ (504,061)