Note 17 - Subsequent Event (Details Textual)	1 Months Ended
Apr. 30, 2020 USD ($)
Subsequent Event [Member]
Proceeds from Paycheck Protection Program Under CARES Act	$ 246,000

The cash inflow received from loan funding under the Paycheck Protection Program which was established under the Coronavirus Aid, Relief and Economic Security (CARES) Act in March 2020.

No definition available.

Name:	mlp_ProceedsFromPaycheckProtectionProgramUnderCARESAct
Namespace Prefix:	mlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration