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Note 10 - Summary of Valuation and Qualifying Accounts (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Balance $ 122,095 $ 125,766
Charged to (recovered) costs and expenses 25,698 (3,671)
Balance 147,793 122,095
Charged to (recovered) costs and expenses $ 25,698 $ (3,671)