Note 5 - Shareholders' Equity (Details Textual) - USD ($)					1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Apr. 01, 2021	Mar. 29, 2021	Jan. 01, 2021	Aug. 14, 2020	Feb. 29, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Nov. 10, 2020	Nov. 09, 2020	Mar. 23, 2018	Dec. 30, 2016
Preferred Stock, Shares Authorized (in shares)						20,000,000				20,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)						$ 0.001				$ 0.001
Stock Issued During Period, Value, Stock Dividend											$ 358,638
Preferred Stock Dividends, Shares (in shares)											126,727
Payments of Ordinary Dividends, Preferred Stock and Preference Stock										$ (0)	$ 26,252
Common Stock Shares Exchanged (in shares)										178,000
Stock Issued During Period, Shares, Warrant Exercise (in shares)											274,120	274,120
Class of Warrant or Right, Exercised During Period (in shares)											770	770
Proceeds from Warrant Exercises										$ 0	$ 35,636	$ 35,636
Deferred Compensation Arrangement with Individual, Shares Issued (in shares)							18,099
Deferred Compensation Arrangement with Individual, Exercise Price (in dollars per share)							$ 2.21
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued							$ 40,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 0.13		$ 0.13
Share-based Payment Arrangement, Reversal Option Expense, Termination of Employees												$ 42,549
Two Thousand Eighteen Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)								10,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)								3 years
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)												$ 2.885
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (in shares)												61,948
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares)												20,459
Two Thousand Eighteen Stock Option Plan [Member] | Share-based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)							7,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)			10 years				10 years
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)							$ 2.21
Two Thousand Eighteen Stock Option Plan [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage							33.33%	33.33%
Two Thousand Eighteen Stock Option Plan [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage							33.33%	33.33%
Two Thousand Eighteen Stock Option Plan [Member] | Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage							33.33%	33.33%
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense						$ 15,030			$ 329,140	64,511	$ 311,129
Share-based Payment Arrangement, Option [Member] | Two Thousand Eighteen Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)														450,000	450,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)												105,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)												3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)												10 years
Share-based Payment Arrangement, Option [Member] | The 2018 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)													900,000
Warrant [Member]
Share-based Payment Arrangement, Expense				$ 318,893
CEO/CFO [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)		1,050,000
Stock Issued During Period, Value, Issued for Services		$ 2,005,500
Deferred Compensation Arrangement with Individual, Shares Issued (in shares)		250,000
Deferred Compensation Arrangement with Individual, Exercise Price (in dollars per share)		$ 1.91
Deferred Compensation Arrangement With Individual, Shares Issued and Subject To Repurchase (in shares)		125,000
Share-based Payment Arrangement, Expense						79,583				397,916
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total						$ 79,584				$ 79,584
ShipTime Acquisition [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)										6,218
Conversion of Series A Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)											4,565,305
Series A Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)						5,000,000				5,000,000		5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)						$ 0.001				$ 0.001		$ 0.001
Preferred Stock, Shares Issued, Total (in shares)						0				0		0				5,000,000
Percentages of Payment Obligation										1.50%
Preferred Stock, Liquidation Preference Per Share (in dollars per share)						$ 3.03				$ 3.03
Preferred Stock Annual Coupon												$ 28,532
ShipTime Canada Stock [Member]
Conversion of Stock, Shares, Convertible (in shares)					1
Common Stock Shares Exchanged (in shares)										500
PAID Preferred Stock [Member]
Conversion of Stock, Shares Issuable (in shares)					45
PAID Common Stock [Member]
Conversion of Stock, Shares Issuable (in shares)					311					356
Common Stock Exercised Shares (in shares)						1,461,078				1,461,078
Exchange of Preferred to Common (in shares)											1,015,851
Paid Series a Preferred Stock Shares Total (in shares)										2,089,298
Common Stock, Capital Shares Reserved for Future Issuance (in shares)						2,213,608				2,213,608
PAID Series A Preferred Stock [Member]
Preferred Stock Exercised Shares (in shares)						1,461,078				1,461,078
Exchange of Preferred to Common (in shares)											1,015,851