Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.4.0.3
Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 0  
Letters of credit outstanding 700,000  
Secured debt | Industrial development bond    
Debt Instrument [Line Items]    
Long-term debt   $ 10,000,000
Payments for planned debt redemption 10,100,000  
Repayments of accrued interest on long-term debt $ 100,000