Note 2 - Acquisition - Purchase Price Allocation (Details) - USD ($)		3 Months Ended	6 Months Ended
	Apr. 03, 2017	Jul. 01, 2017	Sep. 30, 2017	Oct. 01, 2016
Bargain purchase gain			$ (1,096,000)
Truitt Bros. Inc. [Member]
Purchase Price (net of cash received)	$ 31,842,000
Current assets	22,823,000
Other long-term assets	1,744,000
Property, plant and equipment	28,696,000
Current liabilities	(5,068,000)
Deferred taxes	407,000
Other long-term liabilities	(15,664,000)
Bargain purchase gain	$ (1,096,000)	$ (1,096,000)	$ (1,096,000)