Note 6 - Reconciliation of Common Shareholders' Equity, Common Shares and Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Schedule of Stockholders Equity [Table Text Block]

(in thousands)	Par Value, Common Shares			Premium on Common Shares			Retained Earnings			Accumulated Other Comprehensive Income/(Loss)			Total Common Equity
Balance, December 31, 201 6	$	196,741		$	337,684		$	139,479		$	(3,800	)	$	670,104
Common Stock Issuances, Net of Expenses		1,273			3,613									4,886
Common Stock Retirements		(239	)		(1,560	)								(1,799	)
Net Income								36,363						36,363
Other Comprehensive Income											214			214
Employee Stock Incentive Plan s Expense					1,920									1,920
Common Dividends ($0. 64 per share)								(25,284	)					(25,284	)
Balance, June 30, 2017	$	197,775		$	341,657		$	150,558		$	(3,586	)	$	686,404

Schedule of Common Stock Outstanding Roll Forward [Table Text Block]

Common Shares Outstanding December 31, 201 6	39,348,136
Issuances:
Executive Stock Performance Awards (2014 shares earned)	89,291
Automatic Dividend Reinvestment and Share Purchase Plan:
Dividends Reinvested	68,235
Cash Invested	27,348
Vesting of Restricted Stock Units	21,925
Restricted Stock Issued to Directors	17,600
Employee Stock Purchase Plan:
Dividends Reinvested	9,566
Cash Invested	5,284
Employee Stock Ownership Plan	14,835
Directors Deferred Compensation	560
Retirements:
Shares Withheld for Individual Income Tax Requirements	(47,704	)
Common Shares Outstanding June 30, 2017	39,555,076

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months ended June 30				Six Months ended June 30
	201 7		201 6		201 7		201 6
Weighted Average Common Shares Outstanding – Basic		39,462,865		38,179,371		39,406,834		38,058,157
Plus Outstanding Share Awards net of Share Reductions for Unrecognized Stock-Based Compensation Expense and Excess Tax Benefits:
Shares Expected to be Awarded for Stock Performance Awards Granted to Executive Officers based on Measurement Period-to-Date Performance		173,974		91,381		187,806		69,133
Underlying Shares Related to Nonvested Restricted Stock Units Granted to Employees		50,087		39,374		53,980		39,608
Nonvested Restricted Shares		12,719		7,862		19,894		12,819
Shares Expected to be Issued Under the Deferred Compensation Program for Directors		2,854		3,301		3,098		3,532
Total Dilutive Shares		239,634		141,918		264,778		125,092
Weighted Average Common Shares Outstanding – Diluted		39,702,499		38,321,289		39,671,612		38,183,249