Note 13 - Capital Stock and Stock Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		12 Months Ended
	Mar. 08, 2017	Jan. 10, 2017	Mar. 31, 2017	Dec. 31, 2000	Nov. 25, 2017	Nov. 26, 2016	Nov. 28, 2015	Dec. 31, 1997
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price					$ 8.02	$ 10.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term					3 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value					$ 366
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares					0
Payments Related to Tax Withholding for Share-based Compensation					$ 641	$ 77	$ 178
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount					554	$ 87
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation							$ 1,998
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized					$ 910
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					2 years
Stock Issued During Period, Shares, Employee Stock Purchase Plans					6,275	8,502	19,053
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		36,000			42,538
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					66,414
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount					$ 366	$ 46
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation							$ 99
Restricted Stock [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	6,538
Restricted Stock [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					60,600
Shares Paid for Tax Withholding for Share Based Compensation					21,210	2,940	4,836
Payments Related to Tax Withholding for Share-based Compensation					$ 641	$ 77	$ 154
Restricted Stock [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					5,814
The 1997 Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance								950,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized				500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						0
The 2010 Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance					1,250,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant					243,725
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent			85.00%	85.00%