Note 11 - Pension and Postretirement Benefits - Asset Allocation (Details)	Nov. 30, 2019	Dec. 01, 2018
Equity Funds [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation	60.00%
Fixed Income Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocation	40.00%
Fixed Income Funds [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation	40.00%
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation	100.00%
Percentage of Plan Assets at Year End	100.00%	100.00%
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation	100.00%
Percentage of Plan Assets at Year End	100.00%	100.00%
Pension Plan [Member] | Equity Funds [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation	60.00%
Percentage of Plan Assets at Year End	57.70%	59.50%
Pension Plan [Member] | Equity Funds [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation	49.00%
Percentage of Plan Assets at Year End	49.60%	50.80%
Pension Plan [Member] | Fixed Income Funds [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation	40.00%
Percentage of Plan Assets at Year End	63.80%	40.00%
Pension Plan [Member] | Fixed Income Funds [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation	51.00%
Percentage of Plan Assets at Year End	50.10%	48.70%
Pension Plan [Member] | Insurance [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation	0.00%
Percentage of Plan Assets at Year End	0.00%	0.00%
Pension Plan [Member] | Insurance [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation	0.00%
Percentage of Plan Assets at Year End	0.00%	0.00%
Pension Plan [Member] | Cash [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation	0.00%
Percentage of Plan Assets at Year End	(21.50%)	0.50%
Pension Plan [Member] | Cash [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation	0.00%
Percentage of Plan Assets at Year End	0.30%	0.50%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation	100.00%
Percentage of Plan Assets at Year End	100.00%	100.00%
Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocation	0.00%
Percentage of Plan Assets at Year End	0.00%	0.00%
Other Postretirement Benefits Plan [Member] | Fixed Income Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocation	0.00%
Percentage of Plan Assets at Year End	0.00%	0.00%
Other Postretirement Benefits Plan [Member] | Insurance [Member]
Defined Benefit Plan, Target Plan Asset Allocation	100.00%
Percentage of Plan Assets at Year End	99.60%	99.40%
Other Postretirement Benefits Plan [Member] | Cash [Member]
Defined Benefit Plan, Target Plan Asset Allocation	0.00%
Percentage of Plan Assets at Year End	0.40%	0.60%