Clearfield, Inc. Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
cash equivalents	$ 24,635	$ 15
Investment securities:	137,282	28,549
Fair Value, Inputs, Level 1 [Member]
cash equivalents	24,635	15
Investment securities:	0	0
Fair Value, Inputs, Level 2 [Member]
cash equivalents	0	0
Investment securities:	137,282	28,549
Fair Value, Inputs, Level 3 [Member]
cash equivalents	0	0
Investment securities:	0	0
Money Market Funds [Member]
cash equivalents	24,635	15
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
cash equivalents	24,635	15
Money Market Funds [Member] \| Fair Value, Inputs, Level 2 [Member]
cash equivalents	0	0
Money Market Funds [Member] \| Fair Value, Inputs, Level 3 [Member]
cash equivalents	0	0
Certificates of Deposit [Member]
Investment securities:	10,001	13,456
Certificates of Deposit [Member] \| Fair Value, Inputs, Level 1 [Member]
Investment securities:	0	0
Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Investment securities:	10,001	13,456
Certificates of Deposit [Member] \| Fair Value, Inputs, Level 3 [Member]
Investment securities:	0	0
US Treasury Securities [Member]
Investment securities:	127,281	15,093
US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Investment securities:	0	0
US Treasury Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Investment securities:	127,281	15,093
US Treasury Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Investment securities:	$ 0	$ 0