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Note 7 - Equity Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 01, 2015	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		500,000
Share Price	$ 15.09
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	4,639
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
Match [Member]
Shares Matched		2,500	6,500
Restricted Stock Units (RSUs) [Member] \| Five Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested		$ 25
Restricted Stock Units (RSUs) [Member] \| Ten Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested		50
Restricted Stock Units (RSUs) [Member] \| Fifteen Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested		75
Restricted Stock Units (RSUs) [Member] \| Twenty Five Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested		100
Restricted Stock Units (RSUs) [Member] \| Twenty Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested		$ 100
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		92,077
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested		$ 788
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		0	0
ShareBased Compensation Arrangement by ShareBased Payment Award Minimum Number of Shares Per Employee		750
Sharebased Compensation Arrangement bySharebasedPaymentAwardMatchingPurchaseRequirement		500
Sharebased Compensation Arrangement by Sharebased Payment Award Award Match		250
Restricted Stock Units Units Number Converted			1,582	0