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Consolidated Balance Sheets (USD $)
Sep. 30, 2013
Jun. 30, 2013
Current assets:    
Cash and cash equivalents $ 5,284,163 $ 2,899,927
Accounts receivable, net of allowance for doubtful accounts of $47,597 and $52,598, respectively 962,256 923,780
Inventory 436,244 405,571
Other receivables 9,293 11,502
Prepaid expenses and other current assets 210,404 202,880
Total current assets 6,902,360 4,443,660
Fixed assets, net of accumulated depreciation 1,510,009 1,684,282
Restricted cash 181,167 181,149
Inventory, non-current 469,758 469,758
Other assets, net of accumulated amortization 271,394 276,507
Total assets 9,334,688 7,055,356
Current liabilities:    
Accounts payable and accrued liabilities 653,390 432,566
Accrued protocol expense 8,306 25,305
Accrued radioactive waste disposal 112,000 100,000
Accrued payroll and related taxes 84,933 127,419
Accrued vacation 111,276 107,578
Total current liabilities 969,905 792,868
Warrant derivative liability 140,000 104,000
Asset retirement obligation 810,202 792,242
Total liabilities 1,920,107 1,689,110
Commitments and contingencies (Note 6)      
Shareholders' equity:    
Preferred stock, $.001 par value; 7,001,671 shares authorized: 61 59
Common stock, $.001 par value; 192,998,329 and 193,000,000 shares authorized; 38,419,502 and 34,618,517 shares issued and outstanding 38,420 34,618
Treasury stock, at cost 13,200 shares (8,390) (8,390)
Additional paid-in capital 60,746,730 57,431,293
Accumulated deficit (53,362,240) (52,091,334)
Total shareholders' equity 7,414,581 5,366,246
Total liabilities and shareholders' equity 9,334,688 7,055,356
Series A Preferred Stock [Member]
   
Shareholders' equity:    
Preferred stock, $.001 par value; 7,001,671 shares authorized:      
Series B Preferred Stock [Member]
   
Shareholders' equity:    
Preferred stock, $.001 par value; 7,001,671 shares authorized: 59 59
Series C Preferred Stock [Member]
   
Shareholders' equity:    
Preferred stock, $.001 par value; 7,001,671 shares authorized:      
Series D Preferred Stock [Member]
   
Shareholders' equity:    
Preferred stock, $.001 par value; 7,001,671 shares authorized: $ 2