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Note 8 - Concentrations (Details Textual)
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Revenues, Total $ 1,021,042 $ 931,139 $ 1,146,355 $ 3,754,212 $ 5,271,231
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]          
Concentration Risk, Number of Customers       3 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Three Customers [Member]          
Concentration Risk, Percentage       58.00%  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | One Customer [Member]          
Concentration Risk, Percentage         59.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Foreign Customers [Member]          
Concentration Risk, Percentage       8.80% 6.30%
Revenues, Total       $ 341,415 $ 332,693
Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Concentration Risk, Number of Customers       2 1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]          
Concentration Risk, Percentage         83.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]          
Concentration Risk, Percentage       93.00%