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Note J - Deferred Revenue (Details) - Components of Deferred Revenue (USD $)
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current Portion      
Deferred Revenue, Current $ 467,108 $ 508,520 $ 527,092
Long-Term Portion      
Maintenance contracts     1,000
Total   508,520 528,092
Maintenance Contracts [Member]
     
Current Portion      
Deferred Revenue, Current   496,055 335,246
Long-Term Portion      
Maintenance contracts     1,000
Customer Deposit [Member]
     
Current Portion      
Deferred Revenue, Current   12,465 122,500
Fully Deferred Systems, Installation and Acceptance Revenue [Member]
     
Current Portion      
Deferred Revenue, Current     $ 69,346