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Note 15 - Segment Information (Details) - Revenue by Country (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Note 15 - Segment Information (Details) - Revenue by Country [Line Items]      
Revenue by location $ 1,471,100us-gaap_Revenues $ 1,340,200us-gaap_Revenues $ 1,340,200us-gaap_Revenues
UNITED STATES      
Note 15 - Segment Information (Details) - Revenue by Country [Line Items]      
Revenue by location 751,400us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 551,000us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		  
GERMANY      
Note 15 - Segment Information (Details) - Revenue by Country [Line Items]      
Revenue by location 67,100us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_DE		 96,400us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_DE		  
BRAZIL      
Note 15 - Segment Information (Details) - Revenue by Country [Line Items]      
Revenue by location 169,500us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_BR		 157,000us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_BR		  
Other Countries [Member]      
Note 15 - Segment Information (Details) - Revenue by Country [Line Items]      
Revenue by location $ 483,100us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= hpto_OtherCountriesMember		 $ 535,800us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= hpto_OtherCountriesMember