Label	Element	Value
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation	$ 488,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	16,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(110,888,000)
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(109,975,000)
Net Income (Loss) Attributable to Parent	us-gaap_NetIncomeLoss	$ 913,000
Common Stock [Member]
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation	(1,575)
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 390,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 388,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	(22,118)
Shares, Outstanding	us-gaap_SharesOutstanding	39,009,451
Shares, Outstanding	us-gaap_SharesOutstanding	38,730,204
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited And Expirations In Period	loco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedAndExpirationsInPeriod	(255,554)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	$ 0
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	375,734,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	372,825,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	(16,000)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	$ 0