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Note 11 - Net Income Per Share (Details) - Computation of Net Income per Share - Basic & Diluted (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Mar. 31, 2015	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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Computation of Net Income per Share - Basic & Diluted [Abstract]
Net income available for stockholders (in Dollars)	$ 2,239us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,403us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,060us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,881us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,462us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,746us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,932us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,860us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,559us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,543us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,248us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,100us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 9,583us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 9,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 8,450us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average outstanding shares of common stock													3,521us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	3,445us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	3,357us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options													129us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	166us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	236us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Common stock and equivalents													3,650us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	3,611us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	3,593us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net Income per share:
Basic (in Dollars per share)	$ 0.63us-gaap_EarningsPerShareBasic	$ 0.68us-gaap_EarningsPerShareBasic	$ 0.87us-gaap_EarningsPerShareBasic	$ 0.54us-gaap_EarningsPerShareBasic	$ 1.00us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.55us-gaap_EarningsPerShareBasic	$ 0.76us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.63us-gaap_EarningsPerShareBasic	$ 2.72us-gaap_EarningsPerShareBasic	$ 2.61us-gaap_EarningsPerShareBasic	$ 2.52us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)													$ 2.63us-gaap_EarningsPerShareDiluted	$ 2.49us-gaap_EarningsPerShareDiluted	$ 2.35us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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