Shareholders' Equity (Schedule of ESPP Activity) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016
Shares issued from treasury
Shares Issued Under ESPP Plan (shares)	1,034	840	1,511	1,771	1,435	1,170	779	541	5,156	3,925
Closing Market Price (usd per share)	$ 1.98	$ 2.17	$ 1.33	$ 1.16	$ 1.39	$ 2.17	$ 1.80	$ 2.51
Shares Issued Under Loan Program (shares)	0	0	0	0	0	0	0	0	0	0
Dollar Value of Loans Issued	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Repayment of Loans	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Minimum
Shares issued from treasury
Closing Market Price (usd per share)									$ 1.16	$ 1.39
Maximum
Shares issued from treasury
Closing Market Price (usd per share)									$ 2.17	$ 2.51