Note 2 - Earnings Per Share and Share Repurchase Plan (Details) - Computation of Basic and Diluted Earnings Per Share (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013
Computation of Basic and Diluted Earnings Per Share [Abstract]
Numerator for basic and diluted earnings per share - net income (in Dollars)	$ 2,486		$ 2,044		$ 2,172		$ 2,296		$ 1,962		$ 2,128		$ 1,894		$ 2,408		$ 8,998	$ 8,392
Denominator for basic earnings per share - weighted average shares outstanding																	3,291,939	3,248,397
Effect of dilutive securities - employee stock options																	10,635	11,678
Denominator for diluted earnings per share - adjusted weighted average shares outstanding																	3,302,574	3,260,075
Earnings per share - basic (in Dollars per share)	$ 0.75	[1]	$ 0.62	[1]	$ 0.66	[1]	$ 0.70	[1]	$ 0.60	[1]	$ 0.65	[1]	$ 0.58	[1]	$ 0.75	[1]	$ 2.73	$ 2.58
Earnings per share - diluted (in Dollars per share)	$ 0.75	[1]	$ 0.62	[1]	$ 0.66	[1]	$ 0.70	[1]	$ 0.60	[1]	$ 0.65	[1]	$ 0.58	[1]	$ 0.74	[1]	$ 2.72	$ 2.57

[1] Due to rounding, quarterly earnings per share may not sum to annual earnings per share