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Note 11 - Plant Consolidations - Restructuring Charges Associated with the California Consolidations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Rancho Dominguez, California Facility [Member]        
Employee severance $ 18,000
Relocation 66,000
Total $ 84,000
Total     $ 1,900,000