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Stock-Based Compensation Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Mar. 29, 2018
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense   $ 351,000 $ 369,000
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Price $ 33.60    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share $ 33.60