Note 8 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

Year ending December 31:
2019	$	4,417,806
2020		3,750,324
2021		3,042,779
2022		2,102,463
2023		1,289,874
2024		735,375
2025		624,970
2026		420,549
2027		296,974
2028		61,350
Total minimum lease payments	$	16,742,464