Quarterly report pursuant to Section 13 or 15(d)

Line of Credit (Details)

v3.10.0.1
Line of Credit (Details)
Aug. 27, 2018
USD ($)
Sep. 30, 2018
USD ($)
Aug. 26, 2018
USD ($)
Line of Credit Facility [Line Items]      
Revolving credit facility $ 40,000,000    
Financial covenants, minimum net worth $ 180,000,000   $ 185,000,000.0
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, minimum current assets to current liabilities ratio 1.25    
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    
Outstanding borrowings under our Credit Agreement   $ 0  
Total outstanding letters of credit   2,500,000  
Remaining borrowing capacity on line of credit   $ 37,500,000  
Letter of Credit      
Line of Credit Facility [Line Items]      
Stated interest rate 2.00%    
Letter of Credit | London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 2.00%    
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Fees on undrawn borrowings 0.40%