Impact of Recent Accounting Pronouncements (Details) - ASU 2016-01 [Member] $ in Thousands	Jun. 30, 2018 USD ($)
Recent Accounting Pronouncements [Abstract]
Equity investments, amortized cost	$ 62
Equity investments, fair value	217
Cumulative-effect adjustment to increase retained earnings	0	[1]
Retained Earnings [Member]
Recent Accounting Pronouncements [Abstract]
Cumulative-effect adjustment to increase retained earnings	$ 114	[1]

[1] See Note 9 Impact of Recent Accounting Pronouncements - cumulative effect of change in measurement of equity securities.