9. Non-Cash Share-Based Employee Compensation (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Compensation Related Costs [Abstract]
Outstanding stock options | shares	489,000
Vested stock options | shares	185,800
Nonvested stock options | shares	303,200
Issued stock options | shares	0
Exercised stock options | shares	0
Forfeited stock options | shares	0
Expired stock options | shares	0
Outstanding stock options | shares	489,000
Vested stock options | shares	235,800
Nonvested stock options | shares	253,200
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	0.00
Exercised wgt. avg. exercise price	0.00
Forfeited wgt. avg. exercise price	0.00
Expired wgt. avg. exercise price	0.00
Outstanding wgt. avg. exercise price	3.96
Vested wgt. avg. exercise price	4.20
Nonvested wgt. avg. exercise price	$ 3.73
Outstanding contractual life	6 years 11 months 23 days
Vested contractual life	5 years 8 months 8 days
Nonvested contractual life	8 years 2 months 5 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	0.00
Exercised grant date fair value	0.00
Forfeited grant date fair value	0.00
Expired grant date fair value	0.00
Outstanding grant date fair value	1.51
Vested grant date fair value	1.55
Nonvested grant date fair value	1.47
Issued aggregate intrinsic value	$ 20,000
Exercised aggregate intrinsic value | $	$ 20,000
Forfeited aggregate intrinsic value	$ 0
Expired aggregate intrinsic value	$ 0
Outstanding aggregate intrinsic value | $	$ 220,450
Vested aggregate intrinsic value | $	80,410
Nonvested aggregate intrinsic value | $	$ 140,040