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Note 8 - Leases - Lease Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
2020	$ 5,212
2021	4,945
2022	3,914
2023	3,571
2024	3,087
Beyond 2024	5,587
Total Minimum Obligations	26,316
Interest Component of Obligations	(3,987)
Present Value of Minimum Obligations, December 31, 2019	22,329	$ 20,369
OTP [Member]
2020	1,243
2021	1,228
2022	326
2023	268
2024	217
Beyond 2024	283
Total Minimum Obligations	3,565
Interest Component of Obligations	(273)
Present Value of Minimum Obligations, December 31, 2019	3,292	3,609
Nonelectric Companies [Member]
2020	3,969
2021	3,717
2022	3,588
2023	3,303
2024	2,870
Beyond 2024	5,304
Total Minimum Obligations	22,751
Interest Component of Obligations	(3,714)
Present Value of Minimum Obligations, December 31, 2019	$ 19,037	$ 16,760

X

- Definition

Amount of lessee's undiscounted obligation for lease payments for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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X

- Definition

Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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- Definition

Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

+ References

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-Publisher FASB
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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

+ References

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-Publisher FASB
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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

+ References

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Present value of lessee's discounted obligation for lease payments from operating lease.

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