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6. INCOME TAXES - Tax Cuts and Jobs Act (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Corporate income tax rate 35.00% 21.00% 21.00% 21.00%  
Tax expense, one-time transition tax         $ 367,000
Cash, cash equivalents and short-term and long-term investments   $ 59,700,000      
Possible reduction in uncertain tax benefits   0      
Valuation allowance   13,017,000 $ 9,389,000    
Valuation allowance, increase   3,600,000      
Federal net operating loss     $ 378,000    
Federal          
Net operating loss carryforwards for income tax purposes   9,600,000      
Tax credit carryforwards for income tax purposes   3,700,000      
State          
Net operating loss carryforwards for income tax purposes   14,500,000      
Tax credit carryforwards for income tax purposes   $ 4,200,000