Schedule of 2003 Stock Option and Appreciation Rights Plan (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, beginning of year	4,303,900	5,040,450
Options expired	(765,000)	(1,016,870)
Options forfeited	(545,624)	(73,050)
Options outstanding, end of year	3,611,850	4,303,900
2003 Stock Option and Appreciation Rights Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, beginning of year	310,000	985,000
Options expired	(140,000)	(660,000)
Options forfeited	(150,000)	(15,000)
Options outstanding, end of year	20,000	310,000