Note 9 - Business Concentrations

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Concentration Risk Disclosure [Text Block]

Note

9

- Business Concentrations

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. Concentrations of credit risk with respect to accounts receivable are limited because the Company performs credit evaluations, sets credit limits, and monitors the payment patterns of its customers. Cash balances on deposits with financial institutions, at times,

may

exceed federally insured limits. The Company regularly monitors the institutions

’ financial condition.

The Company

’s top

ten

customers accounted for approximately

40.7%,

46.0%

and

53.6%

of the Company’s consolidated revenue for the years ended

December 

31,

2017,

2016

and

2015,

respectively. For the year ended

December 

31,

2017

and

December 31, 2016,

no

individual customer accounted for

10.0%

or more of the Company's consolidated revenue. For the year ended

December 31, 2015

revenue from

one

customer individually represented

15.5%

of the Company’s consolidated revenue. Other than the customer noted above,

no

other customer accounted for

10.0%

or more of the Company’s consolidated revenue in

2015.

Revenue was earned from this customer within the Company’s Completion Services and Well Support Services segments.