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Note 11 - Plant Consolidations - Restructuring Costs (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 18, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Total   $ 25,000 $ 63,000 $ 203,000
Newburyport, Massachusetts Facility [Member]          
Relocation   25,000 63,000 203,000
Total $ 2,100,000 $ 25,000 $ 63,000 $ 203,000