Stock-Based Compensation (Details 1) - Stock option [Member]	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Summary of all stock option plans
Number of Options Outstanding, Beginning Balance | shares	175,600
Number of Options outstanding, Granted | shares	30,000
Number of Options Outstanding, Cancelled | shares	(78,300)
Number of Options Outstanding, Expired | shares	(26,000)
Number of Options Outstanding, Ending Balance | shares	101,300
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares	$ 42
Weighted Average Exercise Price, Expired, Granted | $ / shares	15
Weighted Average Exercise Price, Cancelled | $ / shares	41.3
Weighted Average Exercise Price, Expired | $ / shares	41.5
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares	$ 34.65