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Investments (Tables)

3 Months Ended

Mar. 31, 2019

Debt Securities, Held-to-maturity [Table Text Block]

Below is a summary of the amortized cost and estimated market values of the Company’s marketable securities as of March 31, 2019 and December 31, 2018.

	March 31, 2019				December 31, 2018
	Amortized		Market		Amortized		Market
	Cost		Value		Cost		Value
	(Dollars in thousands)
Municipal bonds:
Current	$	1,834	$	1,839	$	1,525	$	1,532
Due from one through five years		10,194		10,373		9,752		9,861
Due from six through ten years		6,027		6,356		6,239		6,433
Due from eleven through twenty years		2,811		2,906		2,711		2,713
Total	$	20,866	$	21,474	$	20,227	$	20,539

Unrealized Gain (Loss) on Investments [Table Text Block]

The unrealized gains and losses on marketable securities at March 31, 2019, and at December 31, 2018, were as follows:

	March 31, 2019					December 31, 2018
	Unrealized		Unrealized			Unrealized		Unrealized
	Gains		Losses			Gains		Losses
	(Dollars in thousands)
Municipal bonds	$	610	$	(2	)	$	388	$	(76	)