Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues        
Licenses, royalties and fees $ 1,655,600 $ 131,900 $ 1,830,500 $ 290,700
Product and other sales 218,100 227,700 468,600 410,300
Total revenues 1,873,700 359,600 2,299,100 701,000
Cost of revenues        
Licenses, royalties and fees 24,200 26,800 49,200 47,800
Product and other sales 93,400 94,100 185,600 166,300
Total cost of revenues 117,600 120,900 234,800 214,100
Gross profit 1,756,100 238,700 2,064,300 486,900
Operating expenses        
Research and development 36,100 36,500 73,200 72,900
Sales and marketing 168,500 59,800 238,600 120,700
General and administrative 101,500 68,900 204,200 159,600
Total operating expenses 306,100 165,200 516,000 353,200
Net income from operations 1,450,000 73,500 1,548,300 133,700
Other income (expenses)        
Interest income 300 700
Interest expense, bank charges and accretion of interest (2,800) (3,100) (5,700) (19,300)
Total other income (expenses) (2,500) (3,100) (5,000) (19,300)
Net income $ 1,447,500 $ 70,400 $ 1,543,300 $ 114,400
Basic and diluted net income per common share $ .02 $ 0.00 $ .03 $ 0.00
Weighted average common shares outstanding        
Basic 58,616,716 58,599,016 58,616,716 58,599,016
Diluted 58,989,480 58,969,160 58,955,344 58,889,178