Investment Securities (Tables) - USD ($)
$ in Thousands

6 Months Ended

Jun. 30, 2016

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

The investment securities consist of the following at June 30, 2016 and December 31, 2015 (in thousands):

	June 30, 2016		December 31, 2015
Federal and municipal tax-exempt debt securities	$	8,143	$	4,951
Corporate bonds	15,374		25,400
U.S. Treasury securities	3,004		7,537
Commercial paper	699		2,097
Certificates of deposit	500		1,248
Total investment securities	$	27,720	$	41,233

Schedule of Available-for-sale Securities [Line Items]

Investment Maturity Date Range Start

2016

Investment Maturity Date Range End

2036

Investment securities

$ 27,720

$ 41,233

^[1]

Federal tax-exempt debt securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Investment securities

8,143

4,951

Corporate Bond Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Investment securities

15,374

25,400

US Treasury Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Investment securities

3,004

7,537

Commercial Paper [Member]

Schedule of Available-for-sale Securities [Line Items]

Investment securities

699

2,097

Certificates of deposit [Member]

Schedule of Available-for-sale Securities [Line Items]

Investment securities

$ 500

$ 1,248

[1] December 31, 2015 balances were derived from audited consolidated financial statements.