Note 14 - Regulatory Capital Matters - Ratios and Amounts of Common Equity, Capital, and Total Capital to Risk-adjusted Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Total risk-based capital to risk-weighted assets, actual amount	$ 109,309	$ 91,305
Total risk-based capital to risk-weighted assets, actual ratio	12.88%	11.61%
Total risk-based capital to risk-weighted assets, for capital adequacy purposes, amount	$ 67,920	$ 62,938
Total risk-based capital to risk-weighted assets, for capital adequacy purposes, ratio	8.00%	8.00%
Total risk-based capital to risk-weighted assets, for minimum requirements to be well capitalized, amount	$ 84,900	$ 78,672
Total risk-based capital to risk-weighted assets, for minimum requirements to be well capitalized, ratio	10.00%	10.00%
Tier I capital to risk-weighted assets, actual amount	$ 100,429	$ 81,393
Tier I capital to risk-weighted assets, actual ratio	11.83%	10.35%
Tier I capital to risk-weighted assets, for capital adequacy purposes, amount	$ 50,940	$ 47,203
Tier I capital to risk-weighted assets, for capital adequacy purposes, ratio	6.00%	6.00%
Tier I capital to risk-weighted assets, for minimum requirements to be well capitalized, amount	$ 67,920	$ 62,938
Tier I capital to risk-weighted assets, for minimum requirements to be well capitalized, ratio	8.00%	8.00%
Tier 1 capital (to average assets), actual amount	$ 100,429	$ 81,393
Tier 1 capital (to average assets), actual ratio	9.60%	8.70%
Tier 1 capital (to average assets), for capital adequacy purposes, amount	$ 41,837	$ 37,421
Tier 1 capital (to average assets), for capital adequacy purposes, ratio	4.00%	4.00%
Tier 1 capital (to average assets), for minimum requirements to be well capitalized, amount	$ 52,297	$ 46,777
Tier 1 capital (to average assets), for minimum requirements to be well capitalized, ratio	5.00%	5.00%
PBI Bank [Member]
Total risk-based capital to risk-weighted assets, actual amount	$ 100,429	$ 81,393
Total risk-based capital to risk-weighted assets, actual ratio	11.83%	10.35%
Total risk-based capital to risk-weighted assets, for capital adequacy purposes, amount	$ 38,205	$ 35,403
Total risk-based capital to risk-weighted assets, for capital adequacy purposes, ratio	4.50%	4.50%
Total risk-based capital to risk-weighted assets, for minimum requirements to be well capitalized, amount	$ 55,185	$ 51,137
Total risk-based capital to risk-weighted assets, for minimum requirements to be well capitalized, ratio	6.50%	6.50%