Note 17 - Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Assumptions Used in Determining the Fair Value of Stock Options for Grants

The following assumptions were used in determining the fair value of stock options for grants issued in 2018, 2017 and 2016:

	2018	2017	2016
Expected volatility	40.29% - 41.43%	37.73% - 45.91%	42.09% - 46.49%
Expected term	4.60 - 6.80 years	0.97 - 6.80 years	0.99 - 6.80 years
Risk-free interest rate	2.82% - 2.95%	1.06% - 2.22%	0.54% - 1.63%

Summary of Stock Option Activity

The following table is a summary of the Company’s stock option activity issued to employees and related information:

				Weighted Average
	Number of Shares			Exercise Price		Options Exercisable
Outstanding at December 31, 2017		1,484,914		$	32.53		727,645
Granted		231,455			53.61
Exercised		(599,149	)		23.43
Forfeited or expired		(65,597	)		47.55
Outstanding at December 31, 2018		1,051,623			41.41
Exercisable at December 31, 2018		450,110		$	34.40

Summary of Nonvested Stock Options, Restricted Stock and Performance Shares

A summary of the Company’s nonvested stock options, restricted stock and performance shares activity is presented below:

	Nonvested
	Stock Options					Restricted Stock					Performance Shares
	Number of Shares			Weighted- Average Grant-Date Fair Value		Number of Shares			Weighted- Average Grant-Date Fair Value		Number of Shares			Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2017		757,269		$	15.20	265			$	44.23		276,250		$	42.08
Granted		231,455			21.00		9,779			53.70		71,750			50.49
Vested during period		(321,614	)		13.84		(10,044	)		53.45		(46,000	)		41.36
Forfeited		(65,597	)		18.22		–			–		(150,000	)		41.73
Nonvested at December 31, 2018		601,513		$	17.83		-		$	-		152,000		$	46.61