Related Party Transactions (Narrative) (Details)				1 Months Ended		12 Months Ended
	Dec. 16, 2020 USD ($)	Dec. 06, 2019 USD ($)	Dec. 14, 2018 USD ($)	Jan. 31, 2019 USD ($)	Jun. 30, 2011	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 09, 2019 USD ($)	Oct. 29, 2018 USD ($)
Related Party Transaction [Line Items]
Payments to Acquire Businesses, Gross				$ 553,000
CEO Employment Agreement						In June 2011, we entered into a new employment agreement with Edward K. Christian, Chairman, President and CEO, which became effective as of June 1, 2011, and replaced and superseded his prior employment agreement. We entered into amendments to the agreement on February 12, 2016 (the “First Amendment”) and February 26, 2019 (the “Second Amendment”). The First Amendment extended the term of the employment agreement to March 31, 2021. The First Amendment also states that on each anniversary of the effective date of the employment agreement, the Compensation Committee shall determine in its discretion the amount of any annual increases (which shall not be less than the greater of 4% or a defined cost of living increase). Mr. Christian may defer any or all of his annual salary. The Second Amendment extends the term of the employment agreement from March 31, 2021 to March 31, 2025 and also makes certain clarifying modifications to the employment agreement.
Deferred Compensation Details						On December 14, 2018, Mr. Christian agreed to defer approximately $100,000 of his 2019 salary to be paid 100% on January 3, 2020.
Disposal Group, Including Discontinued Operation, Consideration									$ 210,000	$ 9,300,000
Operating Leases, Rent Expense, Minimum Rentals								$ 4,100
Leasee operating leases rent expense						$ 4,100	$ 4,400
Change in control benchmark percentage of combined voting power						30.00%
Change in control benchmark percentage of voting securities						50.00%
Principal Stockholder Employment Agreement [Member]
Related Party Transaction [Line Items]
Compensation, Annual Increase, Maximum Threshold Percentage					4.00%
Deferred Salary, Amount	$ 100,000	$ 100,000	$ 100,000
Deferred Salary, Payment Percentage	100.00%	100.00%	100.00%
Change In Control, Amount Payable, Multiple						2.99
Health Insurance Provided, Period						10 years
Non-compete Agreement Period						3 years
Severance Payment Percentage						100.00%
Severance Payment Period						24 months
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage						100.00%
Average Annual Compensation						$ 1,862,000	$ 1,862,000	$ 1,862,000
Change In Control Agreements [Member]
Related Party Transaction [Line Items]
Change In Control, Amount Payable, Multiple						1.5
Lumpsum Payment Period						45 days
Employee Continuation Period						6 months
Employee Termination Period						6 months
Apex Agreement [Member]
Related Party Transaction [Line Items]
Payments to Acquire Businesses, Gross						$ 23,000,000