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Note 13 - Capital Stock (Details Textual) - USD ($)					12 Months Ended
	Aug. 03, 2018	May 24, 2018	Apr. 02, 2018	May 18, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2000
Preferred Stock, Shares Authorized					5,000,000	5,000,000
Preferred Stock, Shares Outstanding, Ending Balance					0
Employee Stock Purchase Plan, Consecutive Payment Periods							180 days
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date							85.00%
Increase In Number Of Shares Authorized For Issuance Under Stock Option And Incentive Plan			3,400,000	350,000
Employee Stock Purchase Plan Shares Authorized				1,400,000
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total						1,081,404
Stock Issued During Period, Shares, Employee Stock Purchase Plans					190,642	89,308
Employee Stock Ownership Plan, Shares Available for Issuance					318,596
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			20,908,929
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount					4,386,063	3,307,438
Share Price					$ 3.05
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 189,069	$ 2,600,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					$ 3,700,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition					2 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 1.40	$ 1.83
Deferred Compensation Arrangement with Individual, Maximum Contractual Term					10 years
Preferred Stock, Shares Issued, Total					0
Deferred Stock Awards of Market Condition RSU, Approved Aug 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Trading Days	20 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	69,667
Deferred stock awards of Market Condition RSU, Approved May 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Trading Days		20 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value						$ 4.19
Deferred stock awards of Market Condition RSU, Approved 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Trading Days					20 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					529,491
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years
Maximum Percentage Of Target, Number of Restricted Stock Units					150.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 1.98
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					1 year
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					4 years

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