Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Basis of Presentation (Details Textual)

v3.20.1
Note 1 - Basis of Presentation (Details Textual) - Revenue Benchmark [Member] - Customer Concentration Risk [Member] - Three Major Oil and Gas Companies [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Concentration Risk, Percentage 57.00% 63.00%
Number of Major Customers   3