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Note 8 - Equity Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended
	Mar. 02, 2015	Mar. 02, 2014	Sep. 30, 2015	Sep. 30, 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	$ 27.51
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	4,639	2,544
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				1 year
Match [Member]
Shares Matched			8,750	8,375
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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0	7,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 103
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			69,771
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			2,437	1,250