10. Share-Based Employee Compensation (Details 1) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Notes to Financial Statements
Outstanding Stock Options | shares	311,000
Vested Stock Options | shares	231,000
Nonvested Stock Options | shares	80,000
Issued Stock Options | shares	248,500
Exercised Stock Options | shares	125,000
Forfeited Stock Options | shares	80,000
Expired Stock Options | shares	0
Outstanding Stock Options | shares	354,500
Vested Stock Options | shares	113,000
Nonvested Stock Options | shares	241,500
Outstanding Wgt. Avg. Exercise Price	$ 3.48
Vested Wgt. Avg. Exercise Price	3.30
Nonvested Wgt. Avg. Exercise Price	4.01
Issued Wgt. Avg. Exercise Price	4.84
Exercised Wgt. Avg. Exercise Price	2.88
Forfeited Wgt. Avg. Exercise Price	4.31
Expired Wgt. Avg. Exercise Price	0.00
Outstanding Wgt. Avg. Exercise Price	4.46
Vested Wgt. Avg. Exercise Price	3.75
Nonvested Wgt. Avg. Exercise Price	$ 4.80
Outstanding Contractual Life	7 years 4 months 6 days
Vested Contractual Life	3 years 1 month 24 days
Nonvested Contractual Life	9 years 3 months 22 days
Outstanding Grant Date Fair Value	$ 1.96
Vested Grant Date Fair Value	1.97
Nonvested Grant Date Fair Value	1.93
Issued Grant Date Fair Value	1.54
Exercised Grant Date Fair Value	1.62
Forfeited Grant Date Fair Value	1.95
Expired Grant Date Fair Value	0.00
Outstanding Grant Date Fair Value	1.79
Vested Grant Date Fair Value	2.23
Nonvested Grant Date Fair Value	$ 1.58
Outstanding Aggregate Intrinsic Value | $	$ 0
Vested Aggregate Intrinsic Value | $	0
Nonvested Aggregate Intrinsic Value | $	$ 0
Issued Aggregate Intrinsic Value	$ 0
Exercised Aggregate Intrinsic Value | $	$ 0
Forfeited Aggregate Intrinsic Value	$ 0
Expired Aggregate Intrinsic Value	$ 0
Outstanding Aggregate Intrinsic Value | $	$ 34,660
Vested Aggregate Intrinsic Value | $	34,660
Nonvested aggregate intrinsic value | $	$ 0