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Stock-Based Compensation (Schedule of Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Number of Options Outstanding      
Restricted Stock Units outstanding 16,524 3,938 14,000
Weighted Average Grant Dtae Value Per Share      
Restricted Stock Units outstanding $ 11.30