NonCash ShareBased Employee Compensation (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Non-Cash Share-Based Employee Compensation
Outstanding stock options | shares	489,000
Vested stock options | shares	185,800
Nonvested stock options | shares	303,200
Expired stock options | shares	10,000
Issued stock options | shares	202,500
Outstanding stock options | shares	681,500
Vested stock options | shares	359,600
Nonvested stock options | shares	321,900
Outstanding wgt. avg. exercise price	$ 3.96
Vested wgt. avg. exercise price	4.15
Nonvested wgt. avg. exercise price	3.84
Issued wgt. avg. exercise price	3.08
Exercised wgt. avg. exercise price	0
Forfeited wgt. avg. exercise price	0
Expired wgt. avg. exercise price	4.55
Outstanding wgt. avg. exercise price	3.69
Vested wgt. avg. exercise price	3.82
Nonvested wgt. avg. exercise price	$ 3.54
Outstanding contractual life, Beginning	7 years 2 months 23 days
Nonvested contractual life, Begining	8 years 2 months 12 days
Vested contractual life, Begining	5 years 7 months 24 days
Outstanding contractual life, Ending	6 years 10 months 17 days
Vested contractual life, Ending	6 years
Nonvested contractual life, Ending	7 years 6 months 25 days
Outstanding grant date fair value	$ 1.51
Vested grant date fair value	1.55
Nonvested grant date fair value	1.49
Issued grant date fair value	1.16
Exercised grant date fair value	0
Forfeited grant date fair value	0
Expired grant date fair value	1.06
Outstanding grant date fair value	1.41
Vested grant date fair value	1.44
Nonvested grant date fair value	$ 1.38
Outstanding aggregate intrinsic value | $	$ 20,000,000
Vested aggregate intrinsic value | $	20,000,000
Nonvested aggregate intrinsic value | $	0
Issued aggregate intrinsic value | $	0
Forfeited aggregate intrinsic value | $	0
Exercised aggregate intrinsic value | $	0
Outstanding aggregate intrinsic value | $	15,000,000
Vested aggregate intrinsic value | $	15,000,000
Nonvested aggregate intrinsic value | $	$ 0