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Note 2 - Summary of Significant Accounting Policies (Details) - Liability for Manufacturing Warranty - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Liability for Manufacturing Warranty [Abstract]      
Beginning accrued warranty balance $ 938,466 $ 1,312,918 $ 1,372,342
Reduction for labor payments and claims made under the warranty (107,669) (75,966) (79,134)
Accruals related to warranties issued during the period 23,283 25,863 19,710
Adjustment to warranty liability for discontinued operations   (324,349)  
Ending accrued warranty balance $ 854,080 $ 938,466 $ 1,312,918