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Stock-Based Compensation Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense   $ 454,000 $ 410,000 $ 805,000 $ 779,000
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Price $ 36.40        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share $ 36.40