Note 5 - Exit and Disposal Activities - Summary of Pre-tax Restructuring Chargers (Details) - Transition of Production from the Broadway Plant [Member]	Oct. 01, 2017 USD ($)
Total Program	$ 5,406,000
Recognized Costs	2,880,000
Remaining Costs to be Recognized	2,526,000
Employee Severance [Member]
Total Program	1,444,000
Recognized Costs	1,444,000
Remaining Costs to be Recognized	0
Asset Impairment [Member]
Total Program	188,000
Recognized Costs	188,000
Remaining Costs to be Recognized	0
Equipment Relocation Costs [Member]
Total Program	3,011,000
Recognized Costs	1,218,000
Remaining Costs to be Recognized	1,793,000
Other Restructuring [Member]
Total Program	763,000
Recognized Costs	30,000
Remaining Costs to be Recognized	$ 733,000