Revolving Credit Facility	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Revolving Credit Facility	Revolving Credit FacilityOur revolving credit facility (“BOK Revolver”), as amended, provides for maximum borrowings of $30.0 million which is provided by BOKF, NA dba Bank of Oklahoma (“Bank of Oklahoma”). Under the line of credit, there was one standby letter of credit totaling $1.8 million as of December 31, 2020. Borrowings available under the revolving credit facility at December 31, 2020, were $28.2 million. Interest on borrowings is payable monthly at LIBOR plus 2.0%. No fees are associated with the unused portion of the committed amount. As of December 31, 2020 and 2019, we had no balance outstanding under our revolving credit facility. The revolving credit facility expires on July 26, 2021. At December 31, 2020 and 2019, the weighted average interest rate of our revolving credit facility was 2.6% and 4.3%, respectively.At December 31, 2020, we were in compliance with our financial covenants. These covenants require that we meet certain parameters related to our tangible net worth and total liabilities to tangible net worth ratio. At December 31, 2020 our tangible net worth was $350.9 million, which meets the requirement of being at or above $175.0 million. Our total liabilities to tangible net worth ratio was 0.3 to 1.0, which meets the requirement of not being above 2 to 1.