Note 1 - Basis of Presentation (Details Textual) $ in Millions |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2021
USD ($)
|
Dec. 31, 2020
USD ($)
|
|
| Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 9.1 | $ 9.1 |
| Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Three Major Oil and Gas Companies [Member] | ||
| Concentration Risk, Percentage | 67.00% | 62.00% |
| Number of Major Customers | 3 | 3 |
| General and Administrative Expense [Member] | ||
| Employee Retention Credit | $ 2.1 |
| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amount of employee retention credit. No definition available.
|
| X | ||||||||||
- Definition Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|