Note 3 - Exit and Disposal Activities - Summary of Pre-tax Restructuring Chargers (Details) - Transition of Production from the Broadway Plant [Member] - USD ($)	Dec. 31, 2017	Nov. 22, 2016
Total Program	$ 3,617,000
Recognized Costs	3,005,000
Remaining Costs to be Recognized	612,000
Employee Severance [Member]
Total Program	1,363,000
Recognized Costs	1,363,000
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	1,536,000	$ 2,531,000
Recognized Costs	1,424,000
Remaining Costs to be Recognized	112,000
Other Restructuring [Member]
Total Program	530,000
Recognized Costs	30,000
Remaining Costs to be Recognized	$ 500,000