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Note 15 - Acquisitions (Details Textual)
3 Months Ended 12 Months Ended
Jul. 05, 2018
USD ($)
Jul. 01, 2018
USD ($)
Jun. 01, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Business Combination, Acquisition Related Costs       $ 0 $ 0 $ 268,607 $ 281,909
Air Enterprises [Member]              
Number of States in which Entity Operates     1        
CAD Enterprises, Inc. [Member]              
Business Combination, Consideration Transferred, Total $ 21,000,000 $ 21,000,000          
Payments to Acquire Businesses, Gross $ 12,000,000 $ 12,000,000          
Air Enterprises [Member]              
Business Combination, Consideration Transferred, Total     $ 10,250,000