Stock-Based Compensation (Details) - 2006 Plan [Member] - shares	1 Months Ended		6 Months Ended
	May 31, 2017	May 31, 2016	Jun. 30, 2017	Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	6,500,000	4,500,000		3,500,000
Additional shares authorized	2,000,000	1,000,000
Expiration period (in years)			10 years
Shares available to be issued			2,439,809
Stock options outstanding			156,453
Shares of restricted stock outstanding			1,446,831