Derivatives designated as cash flow hedges narrative (Details) - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 25, 2013	Oct. 23, 2010	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Derivative [Line Items]
Notional Amount			$ 11,216,000		$ 11,216,000		$ 11,498,000
Hedging Instrument [Member]
Derivative [Line Items]
Pay rate		2.59%
Notional Amount		$ 5,200,000
Term	5 years	10 years
Hedging Instrument [Member] | Operating Expense [Member]
Derivative [Line Items]
Loss on cash flow hedge ineffectiveness			$ 0	$ 0	$ 0	$ 0	$ 6,000
Hedging Instrument [Member] | Interest Rate Swap 2 [Member]
Derivative [Line Items]
Pay rate	1.43%
Notional Amount	$ 10,000,000
Hedging Instrument [Member] | Pay fixed - receive floating interest rate swap [Member]
Derivative [Line Items]
Pay rate			2.59%		2.59%		2.59%
Notional Amount			$ 5,155,000		$ 5,155,000		$ 5,155,000
Amounts included in accumulated other comprehensive income as unrealized losses			$ 190,000		$ 190,000		$ 185,000