Note 7 - Marketable Securities - Summary of Investments (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Debt securities, cost	$ 4,710,032	$ 3,742,681
Debt securities	4,710,032	3,742,681
Debt securities, unrealized gain
Equity securities, cost	2,660,057	3,626,952
Equity securities	3,034,663	3,879,515
Equity securities, unrealized gain	374,606	252,563
Marketable securities, cost	7,370,089	7,369,633
Marketable securities	7,744,695	7,622,196
Marketable securities, unrealized gain	374,606	252,563
US Treasury Securities [Member]
Debt securities, cost	4,710,032	3,742,681
Debt securities	4,710,032	3,742,681
Debt securities, unrealized gain
Fixed Income Securities [Member]
Equity securities, cost	2,054,744	2,408,799
Equity securities	2,217,322	2,409,213
Equity securities, unrealized gain	162,578	414
Equity And Other Mutual Funds [Member]
Equity securities, cost	605,313	1,218,153
Equity securities	817,341	1,470,302
Equity securities, unrealized gain	$ 212,028	$ 252,149

Cost of investment in debt securities classified as held to maturity and equity securities.

No definition available.

Name:	ug_DebtSecuritiesHeldToMaturityAndEquitySecuritiesFVNICost
Namespace Prefix:	ug_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of investment in debt securities classified as held to maturity and equity securities.

+ References

No definition available.

+ Details

Name:	ug_DebtSecuritiesHeldToMaturityAndEquitySecuritiesFVNIFairValue
Namespace Prefix:	ug_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of accumulated unrealized gain (loss) in debt securities classified as held to maturity and equity securities.

+ References

No definition available.

+ Details

Name:	ug_DebtSecuritiesHeldToMaturityAndEquitySecuritiesFVNIUnrealizedGainLoss
Namespace Prefix:	ug_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Accumulated amount of unrealized gain (loss) on equity securities.

+ References

No definition available.

+ Details

Name:	ug_EquitySecuritiesFvniAccumulatedUnrealizedGainLoss
Namespace Prefix:	ug_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (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_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

+ Details

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

- Definition

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

No definition available.

+ Details

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

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

+ Details

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

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

+ Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ug_EquityAndOtherMutualFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: