Clearfield, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Cover
- Document And Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Note A - Summary of Significant Accounting Policies (Details Textual)

v3.19.3

Note A - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($) shares	Sep. 30, 2017 USD ($) shares	Oct. 01, 2019 USD ($)
Depreciation, Total	$ 1,705,583	$ 1,748,945	$ 1,614,272
Number of Reportable Segments	1
Goodwill, Impairment Loss	$ 0	0	0
Number of Patents Granted	19
Amortization of Intangible Assets, Total	$ 472,827	298,801	7,822
Impairment of Long-Lived Assets Held-for-use	0	0	643,604
Unrecognized Tax Benefits, Ending Balance	0	0
Research and Development Expense, Total	1,089,637	787,364	865,568
Advertising Expense	$ 278,057	$ 365,859	$ 378,217
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount \| shares	268,000	108,000	0
Patents [Member]
Finite-Lived Intangible Asset, Useful Life	20 years	20 years
Maximum [Member] \| Accounting Standards Update 2016-02 [Member] \| Subsequent Event [Member]
Operating Lease, Right-of-Use Asset				$ 2,900,000
Maximum [Member] \| Patents [Member]
Finite-Lived Intangible Asset, Useful Life	20 years
Minimum [Member] \| Accounting Standards Update 2016-02 [Member] \| Subsequent Event [Member]
Operating Lease, Right-of-Use Asset				2,300,000
Operating Lease, Liability, Total				$ 2,300,000

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