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Note 11 - Summary of Valuation and Qualifying Accounts (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Balance $ 122,095 $ 125,766
Charged to (recovered) costs and expenses 16,534 (3,671)
Balance $ 138,629 $ 122,095