Note 14 - Subsequent Event	3 Months Ended
Mar. 31, 2022
Notes to Financial Statements
Subsequent Events [Text Block]	14 – Subsequent Event On May 2, 2022, the Company acquired an additional 30% of RTC Canada for approximately $20.0 million, bringing the Company’s total ownership of RTC Canada to 80%. Prior to acquiring the additional 30%, the Company accounted for the equity interest in RTC Canada using the equity method of accounting. Going forward, the operating results of RTC Canada will be consolidated in the Consolidated Statements of Operations and Comprehensive Income and the Consolidated Balance Sheets from the date of the acquisition. In addition, the operating results of RTC Canada will also be discussed in Management’s Discussion and Analysis of Financial Condition and Results of Operations in the Company’s quarterly and annual reports.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI https://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

Name:	us-gaap_SubsequentEventsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration