Note 7 - Investments and Fair Value of Financial Instruments - Investments (Details) - USD ($)	Mar. 31, 2019	Jun. 30, 2018
Investments, cost	$ 1,036,959	$ 3,204,815
Investments, gross unrealized gains		280,480
Investments, gross unrealized losses	(968)	(281,290)
Investments	1,035,991	3,204,005
Money Market Funds [Member]
Investments, cost	1,000,335	180,138
Investments, gross unrealized gains
Investments, gross unrealized losses
Investments	1,000,335	180,138
Mutual Fund [Member]
Investments, cost		2,500,000
Investments, gross unrealized gains		280,480
Investments, gross unrealized losses
Investments		2,780,480
Hedge Asset [Member]
Investments, cost	33,203	523,100
Investments, gross unrealized gains
Investments, gross unrealized losses		(280,761)
Investments	33,203	242,339
Other Equities [Member]
Investments, cost	3,421	1,577
Investments, gross unrealized gains
Investments, gross unrealized losses	(968)	(529)
Investments	$ 2,453	$ 1,048

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

No definition available.

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_MutualFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=cncg_HedgeAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=cncg_OtherEquitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: