Note C - Inventories (Details Textual)	Sep. 30, 2015 USD ($)
Excess of Replacement or Current Costs over Weighted Average Method Value	$ 211,000

The excess of replacement or current cost over the stated weighted average cost inventory value when the weighted average inventory method is utilized.

No definition available.

Name:	frd_ExcessOfReplacementOrCurrentCostsOverWeightedAverageMethodValue
Namespace Prefix:	frd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant