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NOTE 4 - CONTRACT ASSETS AND LIABILITIES - Costs, Earnings, Billings, Uncompleted Contracts - (Details) - USD ($) | Jun. 30, 2021 | Jun. 30, 2020
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Regulated Operations [Abstract] |  |
Costs incurred on uncompleted contracts | $ 294,783 | $ 448,437
Estimated earnings | 567,978 | 309,248
Costs and estimated earnings on uncompleted contracts | 862,761 | 757,685
Less: Billings to date | 877,500 | 604,852
Costs and estimated earnings in excess of billings on uncompleted contracts | $ (14,739) | $ 152,833

X
- Definition Amount within current period that has been billed to customer. + References No definition available. + Details
Name: | FONR_BillingsToDate
Namespace Prefix: | FONR_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | FONR_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Costs and estimated earnings on uncompleted contracts in excess of billings means the current asset as of the closing date, as properly recorded on seller's balance sheet in accordance with GAAP, representing the amount, in the aggregate, earned on contracts but not yet invoiced to customers, as determined in accordance with GAAP. + References No definition available. + Details
Name: | FONR_CostsAndEstimatedEarningsOnUncompletedContracts
Namespace Prefix: | FONR_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Costs incurred on uncompleted contracts. + References No definition available. + Details
Name: | FONR_CostsIncurredOnUncompletedContracts
Namespace Prefix: | FONR_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated Earnings on uncompleted contracts. + References No definition available. + Details
Name: | FONR_EstimatedEarnings
Namespace Prefix: | FONR_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RegulatedOperationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration