Note 17 - Regulatory Capital Matters - Ratios and Amounts of Common Equity, Capital, and Total Capital to Risk-adjusted Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Total risk-based capital to risk-weighted assets, actual amount	$ 121,335		$ 109,309
Total risk-based capital to risk-weighted assets, actual ratio	12.08%		12.88%
Total risk-based capital to risk-weighted assets, for capital adequacy purposes, amount	$ 80,341		$ 67,920
Total risk-based capital to risk-weighted assets, for capital adequacy purposes, ratio	8.00%	10.50%	8.00%
Total risk-based capital to risk-weighted assets, for minimum requirements to be well capitalized, amount	$ 100,426		$ 84,900
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	$ 112,959		$ 100,429
Tier I capital to risk-weighted assets, actual ratio	11.25%		11.83%
Tier I capital to risk-weighted assets, for capital adequacy purposes, amount	$ 60,256		$ 50,940
Tier I capital to risk-weighted assets, for capital adequacy purposes, ratio	6.00%	8.50%	6.00%
Tier I capital to risk-weighted assets, for minimum requirements to be well capitalized, amount	$ 80,341		$ 67,920
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	$ 112,959		$ 100,429
Tier 1 capital (to average assets), actual ratio	9.99%		9.60%
Tier 1 capital (to average assets), for capital adequacy purposes, amount	$ 45,208		$ 41,837
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	$ 56,510		$ 52,297
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	$ 112,959		$ 100,429
Total risk-based capital to risk-weighted assets, actual ratio	11.25%		11.83%
Total risk-based capital to risk-weighted assets, for capital adequacy purposes, amount	$ 45,192		$ 38,205
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	$ 65,277		$ 55,185
Total risk-based capital to risk-weighted assets, for minimum requirements to be well capitalized, ratio	6.50%		6.50%