Note 5 - Loans - Age Analysis of the Loan Portfolio, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Past due	$ 10,470	$ 10,889
Current	260,458	258,060
Loans	270,928	268,949
Loans Past Due Greater Than 90 Days and Still Accruing	39
Financial Asset, 30 to 59 Days Past Due [Member]
Past due	3,810	4,595
Financial Asset, 60 to 89 Days Past Due [Member]
Past due	931	482
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	5,729	5,812
Gaming [Member]
Past due
Current	22,083	19,899
Loans	22,083	19,899
Loans Past Due Greater Than 90 Days and Still Accruing
Gaming [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due
Gaming [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due
Gaming [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due
Hotel/Motel [Member]
Past due
Current	45,226	47,294
Loans	45,226	47,294
Loans Past Due Greater Than 90 Days and Still Accruing
Hotel/Motel [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due
Hotel/Motel [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due
Hotel/Motel [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due
Real Estate, Construction [Member]
Past due	605	386
Current	19,975	22,823
Loans	20,580	23,209
Loans Past Due Greater Than 90 Days and Still Accruing
Real Estate, Construction [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	241	303
Real Estate, Construction [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	349	69
Real Estate, Construction [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	15	14
Real Estate, Mortgage [Member]
Past due	9,467	10,073
Current	140,092	131,333
Loans	149,559	141,406
Loans Past Due Greater Than 90 Days and Still Accruing	39
Real Estate, Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	3,411	4,150
Real Estate, Mortgage [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	558	343
Real Estate, Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	5,498	5,580
Commercial And Industrial Loan [Member]
Past due	317	368
Current	27,143	30,258
Loans	27,460	30,626
Loans Past Due Greater Than 90 Days and Still Accruing
Commercial And Industrial Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	86	92
Commercial And Industrial Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	15	58
Commercial And Industrial Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	216	218
Other Loan [Member]
Past due	81	62
Current	5,939	6,453
Loans	6,020	6,515
Loans Past Due Greater Than 90 Days and Still Accruing
Other Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past due	72	50
Other Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past due	9	12
Other Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due