Schedule of 2003 Stock Option and Appreciation Rights Plan (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, beginning of year	3,611,850	4,303,900
Options expired	(20,000)	(765,000)
Options forfeited	(167,025)	(545,624)
Options outstanding, end of year	3,516,225	3,611,850
2003 Stock Option and Appreciation Rights Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, beginning of year	20,000	310,000
Options expired	(20,000)	(140,000)
Options forfeited	0	(150,000)
Options outstanding, end of year		20,000