Description of deferred tax assets and liabilities

For deferred tax assets and liabilities, amounts were remeasured based on the rates expected to reverse in the future, which is now 21 percent. As noted above, the Company realized a one-time tax credit due to the TCJA of $1.7 million in 2017.

Statutory income tax rate

21.00%

Income Taxes (Details Textual)	12 Months Ended
Income Taxes (Details Textual)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes (Textual)
Statutory income tax rate	34.00%	34.00%	34.00%
Description of deferred tax assets and liabilities	For deferred tax assets and liabilities, amounts were remeasured based on the rates expected to reverse in the future, which is now 21 percent. As noted above, the Company realized a one-time tax credit due to the TCJA of $1.7 million in 2017.
Maximum [Member]
Income Taxes (Textual)
Statutory income tax rate	35.00%
Minimum [Member]
Income Taxes (Textual)
Statutory income tax rate	21.00%