Note 10 - Income Taxes (Details Textual) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) yr
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent, Total	28.00%	15.00%
Deferred Tax Assets, Operating Loss Carryforwards, Total	$ 5,123	$ 3,541		$ 5,123
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	7,500
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	$ 2,495	3,935		$ 2,495
Cumulative Profit Position, Period	3 years
Number of Additional Stores Added | yr				10
Increase of Non-accrual Loans	$ 2,100
Deferred Tax Assets, Valuation Allowance, Total			$ 0
Liability for Uncertainty in Income Taxes, Current	0			$ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	$ 0	0	0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2017 2018 2019
Expires After December 31, 2031 [Member]
Operating Loss Carryforwards, Total	$ 17,200			17,200
Indifinite Lived [Member]
Operating Loss Carryforwards, Total	6,900			6,900
Other Noncurrent Assets [Member]
Deferred Income Tax Assets, Net, Total	$ 12,600	$ 12,300	$ 12,700	$ 12,600