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CONTRACT ASSETS AND LIABILITIES - Costs, Earnings, Billings, Uncompleted Contracts - (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jun. 30, 2021
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Regulated Operations [Abstract] |  |
Costs incurred on uncompleted contracts | $ 339 | $ 295
Estimated earnings | 524 | 568
Costs and estimated earnings on uncompleted contracts | 863 | 863
Less: Billings to date | (878) | (878)
Total costs and estimated earnings on uncompleted contracts | $ (15) | $ (15)

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: | debit
Period Type: | instant

X
- Definition The amount of costs and estimated earnings on uncompleted contracts. + References No definition available. + Details
Name: | FONR_CostsAndEstimatedEarningsOnUncompletedContracts
Namespace Prefix: | FONR_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of 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

X
- Definition Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings, net of current billings in excess of costs and estimated earnings on uncompleted contracts + References No definition available. + Details
Name: | FONR_TotalCostsAndEstimatedEarningsInExcessOfBillingsOnUncompletedContractsNet
Namespace Prefix: | FONR_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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