Significant Accounting Policies (Policies)

12 Months Ended

Jun. 30, 2022

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

Basis of Presentation and Principles of Consolidation

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP). The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries (collectively the Company). All significant inter-company transactions and balances have been eliminated in consolidation.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash Equivalents

The Company considers currency on hand, demand deposits, time deposits, and all highly liquid investments with an original maturity of three months or less at the date of purchase to be cash and cash equivalents. Cash and cash equivalents are held in various financial institutions in the United States.

Investment, Policy [Policy Text Block]

Investments

Investments in debt securities with original maturities greater than three months and remaining maturities less than one year are classified as “Short-term investments” and included in current assets. Investments with remaining maturities greater than one year are classified as “Investments, non-current” and are included in noncurrent assets. These investments are held to maturity and carried at amortized cost. As of June 30, 2022, there were no investments.

Accounts Receivable [Policy Text Block]

Accounts Receivable

Accounts receivable are stated at the amount that management of the Company expects to collect from outstanding balances. Management provides for probable uncollectible amounts through an allowance for doubtful accounts. Additions to the allowance for doubtful accounts are based on management’s judgment, considering historical experience with write-offs, collections and current credit conditions. Balances which remain outstanding after management has used reasonable collection efforts are written off through a charge to the allowance for doubtful accounts and a credit to the applicable accounts receivable. Payments received subsequent to the time that an account is written off are treated as bad debt recoveries.

Inventory, Policy [Policy Text Block]

Inventory

Inventory is reported at the lower of cost or net realizable value. Cost of raw materials is determined using the weighted average method. Cost of work in process and finished goods is computed using standard cost, which approximates actual cost, on a first-in, first-out basis.

The cost of materials and production costs contained in inventory that are not usable due to the passage of time, and resulting loss of bio-effectiveness, are written off to cost of sales at the time it is determined that the product is no longer usable.

Property, Plant and Equipment, Policy [Policy Text Block]

Property and Equipment

Property and Equipment is capitalized and carried at cost less accumulated depreciation. Depreciation expense is recorded to cost of sales and operating expenses. Normal maintenance and repairs are charged to expense as incurred. When any assets are sold or otherwise disposed of, the cost and accumulated depreciation are reversed with any resulting gain or loss being recognized on the consolidated statement of operations.

Depreciation is computed using the straight-line method over the following estimated useful lives:

Production equipment (in years)	3	to	7
Office equipment (in years)	2	to	10
Furniture and fixtures (in years)	2	to	10

Leasehold improvements are amortized over the shorter of the lease term or the estimated useful life of the asset.

Property and equipment that is acquired but not yet placed in service is recorded on the balance sheets at cost and no depreciation expense or accumulated depreciation is recognized until the property and equipment is placed in service.

Management periodically reviews the net carrying value of all of its long-lived assets on an asset by asset basis. An impairment loss is recognized if the carrying amount of a defined asset group is not recoverable and exceeds its fair value.

Although management has made its best estimate of the factors that affect the carrying value based on current conditions, it is reasonably possible that changes could occur which could adversely affect management’s estimate of net cash flows expected to be generated from its assets that could result in an impairment adjustment.

Other Assets [Policy Text Block]

Prepaid Expenses and Other Assets 

Prepaid expenses and other assets, which include website development costs, trademarks, patents and licenses, are stated at cost, less accumulated amortization. For website development, costs incurred in the planning stage are expensed as incurred whereas costs associated with the application and infrastructure development, graphics development, and content development are capitalized. Amortization of website development costs is computed using the straight-line method over the estimated economic useful lives of the asset. Trademarks and patents include costs, primarily legal, incurred in obtaining them. Amortization of trademarks and patents is computed using the straight-line method over the estimated economic useful lives of the assets. Licenses include costs related to licenses pertaining to the use of technology or operational licenses. These licenses are recorded at stated cost, less accumulated amortization. Amortization of licenses is computed using the straight-line method over the estimated economic useful lives of the assets. The Company periodically reviews the carrying values of other assets and evaluates the recorded basis for any impairment. Any impairment is recognized when the expected future operating cash flows to be derived from the licenses are less than their carrying value.

Asset Retirement Obligation [Policy Text Block]

Asset Retirement Obligation

The estimated fair value of the future retirement costs of the Company’s leased assets and the costs for the decontamination and reclamation of equipment located within the leased assets are recorded as a liability on a discounted basis when a contractual obligation exists; an equivalent amount is capitalized to property and equipment. The initial recorded obligation is discounted using the Company's credit-adjusted risk-free rate and is reviewed periodically for changes in the estimated future costs underlying the obligation. The Company amortizes the initial amount capitalized to property and equipment and recognizes accretion expense in connection with the discounted liability over the estimated remaining useful life of the leased assets. Adjustments and changes to either the timing or amount of the original present value estimate underlying the obligation are made in the period incurred.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Financial Instruments

The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties, other than a forced liquidation sale. At June 30, 2022 and 2021, the carrying value of financial instruments, which included restricted cash, approximated fair value.

Fair Value Measurement, Policy [Policy Text Block]

Fair Value Measurement

When required to measure assets or liabilities at fair value, the Company uses a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used. The Company determines the level within the fair value hierarchy in which the fair value measurements in their entirety fall. The categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Level 1 uses quoted prices in active markets for identical assets or liabilities, Level 2 uses significant other observable inputs, and Level 3 uses significant unobservable inputs. The amount of the total gains or losses for the period are included in earnings that are attributable to the change in unrealized gains or losses relating to those assets and liabilities still held at the reporting date. The Company has no financial assets or liabilities that are adjusted to fair value on a recurring basis.

At June 30, 2022 and 2021, there were no assets or liabilities measured at fair-value on a recurring basis. Certain assets and liabilities are measured at fair value on a non-recurring basis; that is, the instruments are not measured at fair value on an ongoing basis, but are subject to fair value adjustments only in certain circumstances (for example, when there is evidence of impairment).

Revenue [Policy Text Block]

Revenue Recognition

The Company recognizes revenue based on the five-step model for revenue recognition as prescribed by Accounting Standards Codification (ASC) 606, Revenue from Contracts with Customers, as follows: (1) identify the contract with the customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the prices to the performance obligations; and (5) recognize revenue. The Company has some agreements that contain general commercial terms and product prices but do not contain an obligation to provide goods to the customer. Our performance obligation, which is established when the customer submits a purchase order and the Company accepts the order, is to deliver the product based on the purchase order received. The Company typically recognizes revenue at the time of shipment, at which time the title passes to the customer, and there are no further performance obligations. See Note 17.

Shipping and Handling Cost [Policy Text Block]

Shipping and Handling Costs

Shipping and handling costs include charges associated with delivery of goods from the Company’s facilities to its customers and are reflected in cost of sales. The Company has elected to account for shipping and handling activities as a fulfillment cost. Shipping and handling costs paid to the Company by its customers are included in revenue.

Share-Based Payment Arrangement [Policy Text Block]

Share-Based Compensation

The Company measures and recognizes expense for all share-based payments at fair value. The Company uses the Black-Scholes option valuation model to estimate fair value for all stock options and stock warrants on the date of grant. For stock options that vest over time, the Company recognizes compensation cost on a straight-line basis over the requisite service period for the entire award. The Company recognizes forfeitures as they occur.

Research and Development Expense, Policy [Policy Text Block]

Research and Development Costs 

Research and development costs, including salaries, research materials, administrative expenses and contractor fees, are charged to operations as incurred. The cost of equipment used in research and development activities which has alternative uses is capitalized as part of fixed assets and not treated as an expense in the period acquired. Depreciation of capitalized equipment used to perform research and development is classified as research and development expense in the year recognized.

Advertising Cost [Policy Text Block]

Advertising and Marketing Costs

Advertising costs are expensed as incurred except for the cost of tradeshows and related marketing materials which are deferred until the tradeshow occurs. (In thousands)

	For the Years Ended June 30,
	2022		2021		2020
Advertising and marketing costs expensed (including tradeshows)	$	129	$	84	$	141

	At June 30,
	2022		2021
Prepaid marketing expenses deferred until event occurs	$	25	$	21

Commitments and Contingencies, Policy [Policy Text Block]

Legal Contingencies

The Company records contingent liabilities resulting from asserted and unasserted claims against it, when it is probable that a liability has been incurred and the amount of the loss is reasonably estimable. Estimating probable losses requires analysis of multiple factors, in some cases including judgments about the potential actions of third-party claimants and courts. Therefore, actual losses in any future period are inherently uncertain. Currently, the Company does not believe any probable legal proceedings or claims will have a material adverse effect on its financial position or results of operations. However, if actual or estimated probable future losses exceed the Company’s recorded liability for such claims, it would record additional charges as other expense during the period in which the actual loss or change in estimate occurred.

Income Tax, Policy [Policy Text Block]

Income Taxes

Income taxes are accounted for under the liability method in accordance with ASC 740, Income Taxes. Under this method, the Company provides deferred income taxes for temporary differences that will result in taxable or deductible amounts in future years based on the reporting of certain costs in different periods for financial statement and income tax purposes. This method also requires the recognition of future tax benefits such as net operating loss carry-forwards, to the extent that realization of such benefits is not subject to an allowance. A valuation allowance is recognized on deferred tax assets when it is more likely than not that some or all of these deferred tax assets will not be realized. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in operations in the period that includes the enactment of the change. In the event that the Company is assessed penalties and or interest, penalties will be charged to other operating expense and interest will be charged to interest expense in the period that they are assessed. The Company recognizes liabilities for uncertain tax positions based on a two-step process, whereby (1) it is determined whether it is more likely than not that the tax positions will be sustained based on the technical merits of the position and (2) for those tax positions that meet the more likely than not recognition threshold, the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement with the related tax authority would be recognized.

Lessee, Leases [Policy Text Block]

Leases

The Company accounts for its leases under ASC 842, Leases. Under this guidance, arrangements meeting the definition of a lease are classified as operating or financing leases and are recorded on the consolidated balance sheet as both a right-of-use asset and lease liability, calculated by discounting fixed lease payments over the lease term at the rate implicit in the lease or the Company’s incremental borrowing rate. Lease liabilities are increased by interest and reduced by payments each period, and the right-of-use asset is amortized over the lease term. For operating leases, interest on the lease liability and the amortization of the right-of-use asset result in straight-line rent expense over the lease term. Variable lease expenses are recorded when incurred.

Earnings Per Share, Policy [Policy Text Block]

Income (Loss) Per Common Share

Basic earnings per share is calculated by dividing net income (loss) available to common stockholders by the weighted average number of common shares outstanding, and does not include the impact of any potentially dilutive common stock equivalents, including preferred stock, common stock warrants or options that are potentially convertible into common stock, as those would be antidilutive due to the Company’s net loss position.

Securities that could be dilutive in the future are as follows:

	June 30,
	2022		2021		2020
Preferred stock		-		-		59,065
Common stock warrants		2,645,738		2,645,738		6,080,000
Common stock options		6,914,025		4,514,660		5,497,505
Total potential dilutive securities		9,559,763		7,160,398		11,636,570

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

The preparation of consolidated financial statements in accordance with GAAP requires management of the Company to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes of the Company including the allowance for doubtful accounts receivable; net realizable value of the enriched barium inventory; the estimated useful lives used in calculating depreciation and amortization on the Company’s fixed assets, patents, trademarks and other assets; estimated amount and fair value of the asset retirement obligation related to the Company’s production facilities; and inputs to the Black-Scholes calculation used in determining the expense related to share-based compensation including volatility and estimated lives of options granted. Accordingly, actual results could differ from those estimates and affect the amounts reported in the financial statements.

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Pronouncements

Accounting Standards Updates to Become Effective in Future Periods

Other accounting standards that have been issued or proposed by FASB that do not require adoption until a future date are not expected to have a material impact on the consolidated financial statements upon adoption. The Company does not discuss recent pronouncements that are not anticipated to have an impact on or are unrelated to its financial condition, results of operations, cash flows or disclosures.