Note 3 - Securities Available for Sale (Tables)

12 Months Ended

Dec. 31, 2014

Note 3 - Securities Available for Sale (Tables) [Line Items]

Available-for-sale Securities [Table Text Block]

(Dollars in thousands)	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
December 31, 2014
Mortgage-backed securities:
Federal Home Loan Mortgage Corporation	$	1,418		90		0			1,508
Federal National Mortgage Association		1,337		64		0			1,401
		2,755		154		0			2,909
Other marketable securities:
U.S. Government agency obligations		135,014		31		(601	)		134,444
Corporate preferred stock		700		0		(280	)		420
Corporate equity		58		3		0			61
		135,772		34		(881	)		134,925
	$	138,527		188		(881	)		137,834
December 31, 2014
Mortgage-backed securities:
Federal Home Loan Mortgage Corporation	$	2,749		183		0			2,932
Federal National Mortgage Association		2,150		131		0			2,281
		4,899		314		0			5,213
Other marketable securities:
U.S. Government agency obligations		103,030		1		(637	)		102,394
Corporate preferred stock		700		0		(420	)		280
Corporate equity		58		11		0			69
		103,788		12		(1,057	)		102,743
	$	108,687		326		(1,057	)		107,956

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

	Payments Due by Period
(Dollars in thousands)	Total		Less than 1 Year		1-3 Years		4-5 Years		After 5 Years
Contractual Obligations:
Annual rental commitments under non-cancellable operating leases	$	7,265		802		1,557		1,360		3,546
	$	7,265		802		1,557		1,360		3,546

Schedule of Unrealized Loss on Investments [Table Text Block]

(Dollars in thousands)	Less Than Twelve Months							Twelve Months or More							Total
December 31, 2014	# of Investments		Fair Value		Unrealized Losses			# of Investments		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Other marketable securities:
U.S. Government agency obligations		22	$	104,453		(551	)		1	$	4,970		(50	)	$	109,423		(601	)
Corporate preferred stock		0		0		0			1		420		(280	)		420		(280	)
Total temporarily impaired securities		22	$	104,453		(551	)		2	$	5,390		(330	)	$	109,823		(881	)
December 31, 2013
Other marketable securities:
U.S. Government agency obligations		20	$	93,390		(637	)		0	$	0		0		$	93,390		(637	)
Corporate preferred stock		0		0		0			1		280		(420	)		280		(420	)
Total temporarily impaired securities		20	$	93,390		(637	)		1	$	280		(420	)	$	93,670		(1,057	)

Available-for-sale Securities [Member]

Note 3 - Securities Available for Sale (Tables) [Line Items]

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

(Dollars in thousands)	Amortized Cost		Fair Value
Due one year or less	$	86,160		85,843
Due after one year through five years		51,609		51,510
Due after five years through ten years		0		0
Due after ten years		700		420
No stated maturity		58		61
Total	$	138,527		137,834