Stock-Based Compensation (Activity in the Stock Plan) (Details) - shares	1 Months Ended	3 Months Ended	135 Months Ended	183 Months Ended
	May 31, 2014	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2020
Employee Stock Award Plan-2008
Authorized Shares Available for Future Award Grants
Beginning balance (in shares)		834,910	1,900,000
Additional shares authorized (in shares)	1,500,000	0	1,500,000
Number of awards granted (in shares)		(164,332)	(3,280,753)
Number of awards forfeited or expired (in shares)		27,072	578,403
Ending balance (in shares)		697,650	697,650	697,650
Employee Stock Award Plan-2008 | Options Awards
Authorized Shares Available for Future Award Grants
Number of option awards exercised (in shares)		5,700	1,448,889
Employee Stock Award Plan-2008 | Unrestricted Stock Awards
Authorized Shares Available for Future Award Grants
Number of awards granted (in shares)		0	(10,090)
Employee Stock Award Plan-2008 | Restricted Stock Awards
Authorized Shares Available for Future Award Grants
Number of restricted stock awards vested (in shares)		59,040	159,818
Director Plan - 2005
Authorized Shares Available for Future Award Grants
Beginning balance (in shares)		34,863		300,000
Number of awards granted (in shares)		0		(289,140)
Number of awards forfeited or expired (in shares)		0		24,003
Ending balance (in shares)		34,863	34,863	34,863
Director Plan - 2005 | Options Awards
Authorized Shares Available for Future Award Grants
Number of option awards exercised (in shares)		5,857		124,949
Director Plan - 2005 | Restricted Stock Awards
Authorized Shares Available for Future Award Grants
Number of restricted stock awards vested (in shares)		1,300		85,491