Note 4 - Income Taxes (Details Textual) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Apr. 02, 2016	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2016
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				$ 141,000
Deferred Tax Assets, Valuation Allowance	$ 12,700,000			12,700,000
Operating Loss Carryforwards	$ 21,800,000			$ 21,800,000		$ 19,700,000
Taxable Income from Surrender of Policies			$ 24,000,000
Effective Income Tax Rate Reconciliation, Percent	9.50%	(6.10%)		4.70%	(16.00%)