Stock options and awards (Tables)

12 Months Ended

Dec. 31, 2018

Stock options and awards [Abstract]

Schedule of outstanding stock options under company's stock options plans

At December 31, 2018:
Date Granted	Options Outstanding		Exercisable  Options		Exercise Price		Expiration  Date	Weighted Average  Remaining  Life
1/11/09		30,000		30,000		0.69	1/10/19		0.0
4/26/10		20,000		20,000		2.07	4/25/20		1.3
		50,000		50,000	$	1.24			0.6

At December 31, 2017:
Date Granted	Options Outstanding		Exercisable  Options		Exercise Price		Expiration  Date	Weighted Average  Remaining  Life
1/11/09		40,000		40,000		0.69	1/10/19		1.0
4/26/10		20,000		20,000		2.07	4/25/20		2.4
		60,000		60,000	$	1.15			1.5

Schedule of information relating to stock option transactions

	2018					2017
				Weighted					Weighted
				Average					Average
				Exercise					Exercise
	Shares			Price		Shares			Price
Options outstanding beginning of the year		60,000		$	1.15		100,000		$	1.22
Options exercised		(10,000	)		0.69		(40,000	)		1.32
Total		50,000		$	1.24		60,000		$	1.15