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Note 7 - Accrued Liabilities and Other Liabilities - Noncurrent (Details) - Short-term and Long-term Warranty Reserves (USD $)
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Short-term and Long-term Warranty Reserves [Abstract]        
Short-term warranty reserve $ 302,888us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 288,480us-gaap_ProductWarrantyAccrualClassifiedCurrent    
Long-term warranty reserve 22,219us-gaap_ExtendedProductWarrantyAccrualNoncurrent 25,831us-gaap_ExtendedProductWarrantyAccrualNoncurrent    
Total warranty reserve $ 325,107us-gaap_ProductWarrantyAccrual $ 314,311us-gaap_ProductWarrantyAccrual $ 215,758us-gaap_ProductWarrantyAccrual $ 212,759us-gaap_ProductWarrantyAccrual