Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Equity Securities, FV-NI, Gain (Loss), Total		$ (27)
Equity Securities, Cost, Restricted		$ 3,100	2,800
Loans Still Classified as Non-accrual Status, Period of Past Due		90 days
Financing Receivable Performance Period Under Loan Terms for Reclassification from Non-accrual Status		180 days
Outstanding Loans Balances That Are Considered to Be Within Homogeneous Pools and Not Individually Evaluated for Impairment, Maximum		$ 100
Minimum Balance of Impaired Loan Relationships That Are Individually Evaluated for Impairment		100
Loans Sold, Principal Balance		5,700	900
Unrecognized Tax Benefits, Ending Balance		0	0
Reclassification from Accumulated Other Comprehensive Income to Retained Earnings
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member]
Operating Lease, Right-of-Use Asset				$ 3,700
Operating Lease, Liability, Total				$ 3,500
Retained Earnings [Member]
Reclassification from Accumulated Other Comprehensive Income to Retained Earnings		(65)	287
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
Reclassification from Accumulated Other Comprehensive Income to Retained Earnings	$ (65)
AOCI Attributable to Parent [Member]
Reclassification from Accumulated Other Comprehensive Income to Retained Earnings		65	(287)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]
Reclassification from Accumulated Other Comprehensive Income to Retained Earnings	$ 65
Other Liabilities [Member] | Guaranteed Minimum Death Benefit [Member]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk		$ 111	$ 108