Quarterly report pursuant to Section 13 or 15(d)

Line of Credit (Details)

v3.10.0.1
Line of Credit (Details)
6 Months Ended
Jun. 30, 2018
USD ($)
Line of Credit Facility [Line Items]  
Revolving credit facility $ 40,000,000
Outstanding borrowings under our Credit Agreement 0
Total outstanding letters of credit 5,500,000
Remaining borrowing capacity on line of credit $ 34,500,000
Financial covenants, minimum current assets to current liabilities ratio 1.25
Financial covenants, minimum net worth $ 185,000,000
Financial covenants, percent of net income added to net worth requirement 50.00%
Financial covenants, percent of gain on sale of assets added to net worth requirement 50.00%
Financial covenants, percent of proceeds from stock issuance added to net worth requirement 100.00%
Financial covenant, maximum funded debt to tangible net worth ratio 0.5
Letter of Credit  
Line of Credit Facility [Line Items]  
Stated interest rate 2.00%
Revolving Credit Facility  
Line of Credit Facility [Line Items]  
Fees on undrawn borrowings 0.40%
London Interbank Offered Rate (LIBOR) | Letter of Credit  
Line of Credit Facility [Line Items]  
Basis spread on variable rate 2.00%