Note 9 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Year ending December 31:
201 8	$	4,324,431
2019		3,579,430
2020		2,968,426
2021		2,255,792
202 2		1,461,280
202 3		832,593
2024		546,843
2025		432,990
202 6		221,967
202 7		96,398
Total minimum lease payments	$	16,720,150